clink.pl: fix libexpatd.lib link error when using MSVC

When building with `make MSVC=1 DEBUG=1`, link to `libexpatd.lib`
rather than `libexpat.lib`.

It appears that the `vcpkg` package for "libexpat" has changed and now
creates `libexpatd.lib` for debug mode builds.  Previously, both debug
and release builds created a ".lib" with the same basename.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>

compat/vcbuild/scripts/clink.pl

@@ -66,7 +66,11 @@
 		}
 		push(@args, $lib);
 	} elsif ("$arg" eq "-lexpat") {
+	    if ($is_debug) {
+		push(@args, "libexpatd.lib");
+	    } else {
 		push(@args, "libexpat.lib");
+	    }
 	} elsif ("$arg" =~ /^-L/ && "$arg" ne "-LTCG") {
 		$arg =~ s/^-L/-LIBPATH:/;
 		push(@lflags, $arg);