treewide: add direct includes currently only pulled in transitively

The next commit will remove a bunch of unnecessary includes, but to do
so, we need some of the lower level direct includes that files rely on
to be explicitly specified.

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

Author: newren

builtin/commit-graph.c

@@ -11,6 +11,7 @@
 #include "object-store-ll.h"
 #include "progress.h"
 #include "replace-object.h"
+#include "strbuf.h"
 #include "tag.h"
 #include "trace2.h"
 

builtin/for-each-ref.c

@@ -1,4 +1,5 @@
 #include "builtin.h"
+#include "commit.h"
 #include "config.h"
 #include "gettext.h"
 #include "object.h"

builtin/fsmonitor--daemon.c

@@ -12,6 +12,7 @@
 #include "compat/fsmonitor/fsm-health.h"
 #include "compat/fsmonitor/fsm-listen.h"
 #include "fsmonitor--daemon.h"
+#include "repository.h"
 #include "simple-ipc.h"
 #include "khash.h"
 #include "pkt-line.h"

commit-graph.c

@@ -1,5 +1,6 @@
 #include "git-compat-util.h"
 #include "config.h"
+#include "csum-file.h"
 #include "gettext.h"
 #include "hex.h"
 #include "lockfile.h"