shell: Enable fnmatch/glob by default

As fnmatch(3) and glob(3) from glibc are now working consistently,
this patch enables them by default.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

configure.ac

@@ -37,9 +37,10 @@ if test "$enable_static" = "yes"; then
 	export LDFLAGS="-static -Wl,--fatal-warnings"
 fi
 
-AC_ARG_ENABLE(fnmatch, AS_HELP_STRING(--enable-fnmatch, \
-				      [Use fnmatch(3) from libc]))
-AC_ARG_ENABLE(glob, AS_HELP_STRING(--enable-glob, [Use glob(3) from libc]))
+AC_ARG_ENABLE(fnmatch, AS_HELP_STRING(--disable-fnmatch, \
+				      [Do not use fnmatch(3) from libc]))
+AC_ARG_ENABLE(glob, AS_HELP_STRING(--disable-glob, \
+				   [Do not use glob(3) from libc]))
 
 dnl Checks for libraries.
 
@@ -122,12 +123,12 @@ if test "$enable_test_workaround" = "yes"; then
 		[Define if your faccessat tells root all files are executable])
 fi
 
-if test "$enable_fnmatch" = yes; then
+if test "$enable_fnmatch" != no; then
 	use_fnmatch=
 	AC_CHECK_FUNCS(fnmatch, use_fnmatch=yes)
 fi
 
-if test "$use_fnmatch" = yes && test "$enable_glob" = yes; then
+if test "$use_fnmatch" = yes && test "$enable_glob" != no; then
 	AC_CHECK_FUNCS(glob)
 fi