git-compat-util.h: remove unneccessary include of wildmatch.h

The include of wildmatch.h in git-compat-util.h was added in cebcab189a
(Makefile: add USE_WILDMATCH to use wildmatch as fnmatch, 2013-01-01) as
a way to be able to compile-time force any calls to fnmatch() to instead
invoke wildmatch().  The defines and inline function were removed in
70a8fc999d (stop using fnmatch (either native or compat), 2014-02-15),
and this include in git-compat-util.h has been unnecessary ever since.

Remove the include from git-compat-util.h, but add it to the .c files
that had omitted the direct #include they needed.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

fmt-merge-msg.c

@@ -15,6 +15,7 @@
 #include "fmt-merge-msg.h"
 #include "commit-reach.h"
 #include "gpg-interface.h"
+#include "wildmatch.h"
 
 static int use_branch_desc;
 static int suppress_dest_pattern_seen;