Handle intrin files on win32 with gcc

This fixes #20033.

When building on Windows with Strawberry 5.32.1 (gcc 8.3.0) as the toolchain,
the Errno.pm is created by a script Errno_pm.pl, which takes output from the
compiler to find headers.

A subset of these headers requires them to only be included by some specific
headers. Previously the header order was effectively random and this
occasionally caused build errors (that further were never detected).

The get_files() is now returning the header names in the order the compiler
saw them which insures they are in the right order.

.mailmap

@@ -495,6 +495,7 @@ Keith Thompson <keith.s.thompson@gmail.com> Keith Thompson <kst@mib.org>
 Ken Neighbors <unknown> Ken Neighbors <perlbug@perl.org>
 Ken Williams <ken@mathforum.org> <kenahoo@gmail.com>
 Ken Williams <ken@mathforum.org> Ken Williams <ken.williams@thomsonreuters.com>
+Kenneth Ölwing <knth@cpan.org> Kenneth Olwing <knth@cpan.org>
 Kent Fredric <kentfredric@gmail.com> Kent Fredric <kentnl@cpan.org>
 Kevin Brintnall <kbrint@rufus.net> kevin brintnall <kbrint@rufus.net>
 Kevin Ryde <user42@zip.com.au> Kevin Ryde <perlbug-followup@perl.org>

AUTHORS

@@ -783,6 +783,7 @@ Ken Williams                   <ken@mathforum.org>
 Kenichi Ishigaki               <ishigaki@cpan.org>
 Kenneth Albanowski             <kjahds@kjahds.com>
 Kenneth Duda                   <kjd@cisco.com>
+Kenneth Ölwing                 <knth@cpan.org>
 Kent Fredric                   <kentfredric@gmail.com>
 Keong Lim                      <Keong.Lim@sr.com.au>
 Kevin Brintnall                <kbrint@rufus.net>

ext/Errno/Errno_pm.PL

@@ -2,7 +2,7 @@ use ExtUtils::MakeMaker;
 use Config;
 use strict;
 
-our $VERSION = "1.36";
+our $VERSION = "1.37";
 
 my %err = ();
 
@@ -18,18 +18,11 @@ if ($Config{gccversion} ne '' && $^O eq 'MSWin32') {
     # MinGW complains "warning: #pragma system_header ignored outside include
     # file" if the header files are processed individually, so include them
     # all in .c file and process that instead.
-    my %seen;
     open INCS, '>', 'includes.c' or
 	die "Cannot open includes.c";
     foreach $file (@files) {
 	next if $file eq 'errno.c';
 	next unless -f $file;
-	if ( $file eq 'avx512vpopcntdqvlintrin.h' || $file eq 'avx512bwintrin.h' ) {
-		# "Never use <avx512bwintrin.h> directly; include <immintrin.h> instead."
-		# "Never use <avx512vpopcntdqvlintrin.h> directly; include <immintrin.h> instead."
-		$file = 'immintrin.h';
-	}
-	next if ++$seen{$file} > 1;
 	print INCS qq[#include "$file"\n];
     }
     close INCS;
@@ -114,7 +107,7 @@ sub default_cpp {
 }
 
 sub get_files {
-    my %file = ();
+    my @file;
     # When cross-compiling we may store a path for gcc's "sysroot" option:
     my $sysroot = $Config{sysroot} || '';
     my $linux_errno_h;
@@ -128,34 +121,34 @@ sub get_files {
 
     # VMS keeps its include files in system libraries
     if ($^O eq 'VMS') {
-	$file{'Sys$Library:DECC$RTLDEF.TLB'} = 1;
+	push(@file, 'Sys$Library:DECC$RTLDEF.TLB');
     } elsif ($^O eq 'os390') {
 	# OS/390 C compiler doesn't generate #file or #line directives
         # and it does not tag the header as 1047 (EBCDIC), so make a local
         # copy and tag it
         my $cp = `cp /usr/include/errno.h ./errno.h`;
         my $chtag = `chtag -t -cIBM-1047 ./errno.h`;
-	$file{'./errno.h'} = 1;
+	push(@file, './errno.h');
     } elsif ($Config{archname} eq 'arm-riscos') {
 	# Watch out for cross compiling for RISC OS
 	my $dep = `echo "#include <errno.h>" | gcc -E -M -`;
 	if ($dep =~ /(\S+errno\.h)/) {
-	     $file{$1} = 1;
+	     push(@file, $1);
 	}
     } elsif ($^O eq 'linux' &&
 	      $Config{gccversion} ne '' && 
 	      $Config{gccversion} !~ /intel/i &&
 	      # might be using, say, Intel's icc
 	      $linux_errno_h
 	     ) {
-	$file{$linux_errno_h} = 1;
+	push(@file, $linux_errno_h);
     } elsif ($^O eq 'haiku') {
 	# hidden in a special place
-	$file{'/boot/system/develop/headers/posix/errno.h'} = 1;
+	push(@file, '/boot/system/develop/headers/posix/errno.h');
 
     } elsif ($^O eq 'vos') {
 	# avoid problem where cpp returns non-POSIX pathnames
-	$file{'/system/include_library/errno.h'} = 1;
+	push(@file, '/system/include_library/errno.h');
     } else {
 	open(CPPI, '>', 'errno.c') or
 	    die "Cannot open errno.c";
@@ -183,16 +176,28 @@ sub get_files {
 		if (/$pat/o) {
 		   my $f = $1;
 		   $f =~ s,\\\\,/,g;
-		   $file{$f} = 1;
+		   push(@file, $f);
 		}
 	    }
 	    else {
-		$file{$1} = 1 if /$pat/o;
+		push(@file, $1) if /$pat/o;
 	    }
 	}
 	close(CPPO);
     }
-    return keys %file;
+    return uniq(@file);
+}
+
+# 
+#
+sub uniq
+{
+	# At this point List::Util::uniq appears not to be usable so
+	# roll our own.
+	#
+	# Returns a list with unique values, while keeping the order
+	#
+	return do { my %seen; grep { !$seen{$_}++ } @_ };
 }
 
 sub write_errno_pm {
@@ -364,7 +369,7 @@ ESQ
 
     if ($IsMSWin32) {
 	print "    WINSOCK => [qw(\n";
-	$k = join(" ", grep { /^WSAE/ } keys %err);
+	$k = join(" ", grep { /^WSAE/ } sort keys %err);
 	$k =~ s/(.{50,70})\s/$1\n\t/g;
 	print "\t",$k,"\n    )],\n";
     }