Merge branch 'jk/no-system-includes-in-dot-c' into maint

Compilation fix.

* jk/no-system-includes-in-dot-c:
  wt-status.h: drop stdio.h include
  verify-tag: drop signal.h include

builtin/verify-commit.c

@@ -12,7 +12,6 @@
 #include "repository.h"
 #include "commit.h"
 #include "run-command.h"
-#include <signal.h>
 #include "parse-options.h"
 #include "gpg-interface.h"
 

builtin/verify-tag.c

@@ -10,7 +10,6 @@
 #include "builtin.h"
 #include "tag.h"
 #include "run-command.h"
-#include <signal.h>
 #include "parse-options.h"
 #include "gpg-interface.h"
 #include "ref-filter.h"

wt-status.h

 #ifndef STATUS_H
 #define STATUS_H
 
-#include <stdio.h>
 #include "string-list.h"
 #include "color.h"
 #include "pathspec.h"