Sync HAVE_GRP_H definition (#14514)

This syncs the HAVE_GRP_H definition on Windows (manually defined) and
Autotools (checked with AC_CHECK_HEADERS):
HAVE_GRP_H is is either undefined or defined to value 1.

Author: petk

ext/standard/filestat.c

@@ -63,7 +63,7 @@
 # endif
 #endif
 
-#if HAVE_GRP_H
+#ifdef HAVE_GRP_H
 # include <grp.h>
 #endif
 

ext/standard/link.c

@@ -37,7 +37,7 @@
 #include <pwd.h>
 #endif
 #endif
-#if HAVE_GRP_H
+#ifdef HAVE_GRP_H
 # include <grp.h>
 #endif
 #include <errno.h>

ext/standard/pageinfo.c

@@ -27,7 +27,7 @@
 #include <pwd.h>
 #endif
 #endif
-#if HAVE_GRP_H
+#ifdef HAVE_GRP_H
 # include <grp.h>
 #endif
 #ifdef PHP_WIN32

win32/build/config.w32.h.in

@@ -66,7 +66,7 @@
 #define HAVE_UTIME 1
 #undef HAVE_DIRENT_H
 #define HAVE_FCNTL_H 1
-#define HAVE_GRP_H 0
+#undef HAVE_GRP_H
 #undef HAVE_PWD_H
 #undef HAVE_SYS_FILE_H
 #undef HAVE_SYS_SOCKET_H