msvc: fix "REG_STARTEND" issue

From: Johannes Schindelin <[email protected]>

In 897d68e7af82 (Makefile: use curl-config --cflags, 2020-03-26), we taught the build process to use curl-config --cflags to make sure that it can find cURL's headers.

In the MSVC build, this is completely bogus because we're running in a Git for Windows SDK whose curl-config supports the _GCC_ build.

Let's just ignore each and every -I<path> option where <path> points to GCC/Clang specific headers.

Reported by Jeff Hostetler in
https://github.com/microsoft/git/issues/275.

---
msvc: fix "REG_STARTEND" issue

The MSVC build is actually not tested in our CI/PR builds, that's how this regression could creep in.

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-648%2Fdscho%2Ffix-msvc-build-git-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-648/dscho/fix-msvc-build-git-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/648

 compat/vcbuild/scripts/clink.pl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

index d9f71b7cbb7..61ad084a7b7 100755
@@ -23,7 +23,9 @@
 	    # before any "-l*" flags.
 	    $is_debug = 1;
 	}
-	if ("$arg" =~ /^-[DIMGOZ]/) {
+	if ("$arg" =~ /^-I\/mingw(32|64)/) {
+		# eat
+	} elsif ("$arg" =~ /^-[DIMGOZ]/) {
 		push(@cflags, $arg);
 	} elsif ("$arg" eq "-o") {
 		my $file_out = shift @ARGV;

base-commit: 20514004ddf1a3528de8933bc32f284e175e1012

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