PHPC-2019: Remove Solaris checks in m4 build scripts

libmongoc removed Solaris support in version 1.8.0 so there is no reason to retain these checks.

Author: jmikola

scripts/autotools/libmongoc/FindDependencies.m4

@@ -1,12 +1,3 @@
-# Solaris needs to link against socket libs
-if test "$os_solaris" = "yes"; then
-    PHP_MONGODB_BUNDLED_CFLAGS="$PHP_MONGODB_BUNDLED_CFLAGS -D__EXTENSIONS__"
-    PHP_MONGODB_BUNDLED_CFLAGS="$PHP_MONGODB_BUNDLED_CFLAGS -D_XOPEN_SOURCE=1"
-    PHP_MONGODB_BUNDLED_CFLAGS="$PHP_MONGODB_BUNDLED_CFLAGS -D_XOPEN_SOURCE_EXTENDED=1"
-    PHP_ADD_LIBRARY([socket],,[MONGODB_SHARED_LIBADD])
-    PHP_ADD_LIBRARY([nsl],,[MONGODB_SHARED_LIBADD])
-fi
-
 # Check for shm functions
 AC_CHECK_FUNCS([shm_open],[],[
   AC_CHECK_LIB([rt],

scripts/autotools/libmongoc/PlatformFlags.m4

@@ -8,8 +8,3 @@ AS_IF([test "$os_darwin" = "yes"],
       [AX_CHECK_COMPILE_FLAG([-Wno-unneeded-internal-declaration], [STD_CFLAGS="$STD_CFLAGS -Wno-unneeded-internal-declaration"])])
 AS_IF([test "$os_darwin" = "yes"],
       [AX_CHECK_COMPILE_FLAG([-Wno-error=unused-command-line-argument], [STD_CFLAGS="$STD_CFLAGS -Wno-error=unused-command-line-argument"])])
-dnl We know there are some cast-align issues on Solaris
-AS_IF([test "$os_solaris" = "yes"],
-      [AX_CHECK_COMPILE_FLAG([-Wno-cast-align], [STD_CFLAGS="$STD_CFLAGS -Wno-cast-align"])])
-
-