builtin.h: remove unneccessary includes

This also made it clear that a few .c files under builtin/ were
depending upon some headers but had forgotten to #include them.  Add the
missing direct includes while at it.

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

builtin.h

@@ -2,8 +2,6 @@
 #define BUILTIN_H
 
 #include "git-compat-util.h"
-#include "strbuf.h"
-#include "commit.h"
 
 /*
  * builtin API

builtin/check-mailmap.c

@@ -4,6 +4,7 @@
 #include "ident.h"
 #include "mailmap.h"
 #include "parse-options.h"
+#include "strbuf.h"
 #include "string-list.h"
 #include "write-or-die.h"
 

builtin/commit-graph.c

@@ -1,4 +1,5 @@
 #include "builtin.h"
+#include "commit.h"
 #include "config.h"
 #include "dir.h"
 #include "environment.h"

builtin/config.c

@@ -13,6 +13,7 @@
 #include "path.h"
 #include "quote.h"
 #include "setup.h"
+#include "strbuf.h"
 #include "worktree.h"
 #include "wrapper.h"
 

builtin/credential-cache.c

@@ -2,6 +2,7 @@
 #include "gettext.h"
 #include "parse-options.h"
 #include "path.h"
+#include "strbuf.h"
 #include "wrapper.h"
 #include "write-or-die.h"
 

builtin/for-each-ref.c

@@ -5,6 +5,7 @@
 #include "object.h"
 #include "parse-options.h"
 #include "ref-filter.h"
+#include "strbuf.h"
 #include "strvec.h"
 #include "commit-reach.h"
 

builtin/init-db.c

@@ -12,6 +12,7 @@
 #include "parse-options.h"
 #include "path.h"
 #include "setup.h"
+#include "strbuf.h"
 #include "wrapper.h"
 
 static int guess_repository_type(const char *git_dir)

builtin/verify-pack.c

@@ -3,6 +3,7 @@
 #include "gettext.h"
 #include "run-command.h"
 #include "parse-options.h"
+#include "strbuf.h"
 
 #define VERIFY_PACK_VERBOSE 01
 #define VERIFY_PACK_STAT_ONLY 02