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/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"