Move G_POLLFD_FORMAT to glibconfig.h

It's a platform-specific macro, so it belongs in glibconfig.h.
This ensures that g-ir-scanner will not pick the wrong definition
for introspection.

https://bugzilla.gnome.org/show_bug.cgi?id=757294

configure.ac

@@ -125,6 +125,7 @@ case "$host" in
   *-*-mingw*)
     glib_native_win32=yes
     glib_pid_type='void *'
+    glib_pollfd_format='%#x'
     glib_cv_stack_grows=no
     # Unfortunately the mingw implementations of C99-style snprintf and vsnprintf
     # don't seem to be quite good enough, at least not in mingw-runtime-3.14.
@@ -138,6 +139,7 @@ case "$host" in
     case "$host" in
     x86_64-*-*)
       LIB_EXE_MACHINE_FLAG=X64
+      glib_pollfd_format='%#I64x'
       ;;
     esac
 
@@ -146,6 +148,7 @@ case "$host" in
   *)
     glib_native_win32=no
     glib_pid_type=int
+    glib_pollfd_format='%d'
     ;;
 esac
 case $host in
@@ -2866,6 +2869,8 @@ typedef gint64 goffset;
 #define G_GOFFSET_FORMAT        G_GINT64_FORMAT
 #define G_GOFFSET_CONSTANT(val) G_GINT64_CONSTANT(val)
 
+#define G_POLLFD_FORMAT $g_pollfd_format
+
 _______EOF
 
 	if test -z "$glib_unknown_void_p"; then
@@ -3333,8 +3338,9 @@ g_memory_barrier_needed="$glib_memory_barrier_needed"
 g_gcc_atomic_ops="$glib_cv_gcc_has_builtin_atomic_operations"
 
 g_module_suffix="$glib_gmodule_suffix"
-
 g_pid_type="$glib_pid_type"
+g_pollfd_format="\"$glib_pollfd_format\""
+
 case $host in
   *-*-cygwin*)
     glib_os="#define G_OS_UNIX

glib/glibconfig.h.win32.in

@@ -115,6 +115,8 @@ typedef gint64 goffset;
 
 #ifndef _WIN64
 
+#define G_POLLFD_FORMAT "%#x"
+
 #define GPOINTER_TO_INT(p)	((gint)   (p))
 #define GPOINTER_TO_UINT(p)	((guint)  (p))
 
@@ -130,6 +132,8 @@ typedef unsigned int guintptr;
 
 #else
 
+#define G_POLLFD_FORMAT "%#I64x"
+
 #define GPOINTER_TO_INT(p)	((gint)  (gint64) (p))
 #define GPOINTER_TO_UINT(p)	((guint) (guint64) (p))
 

glib/gpoll.h

@@ -22,6 +22,7 @@
 #error "Only <glib.h> can be included directly."
 #endif
 
+#include <glibconfig.h>
 #include <glib/gtypes.h>
 
 G_BEGIN_DECLS
@@ -106,15 +107,7 @@ struct _GPollFD
  * A format specifier that can be used in printf()-style format strings
  * when printing the @fd member of a #GPollFD.
  */
-#ifdef G_OS_WIN32
-#if GLIB_SIZEOF_VOID_P == 8
-#define G_POLLFD_FORMAT "%#I64x"
-#else
-#define G_POLLFD_FORMAT "%#x"
-#endif
-#else
-#define G_POLLFD_FORMAT "%d"
-#endif
+/* defined in glibconfig.h */
 
 GLIB_AVAILABLE_IN_ALL
 gint