Fix GIO build on Solaris

Major and minor are defined in sys/mkdev.h on Solaris

Patch by Fabian Groffen
https://bugzilla.gnome.org/show_bug.cgi?id=637013

gio/gdbusmessage.c

@@ -29,6 +29,9 @@
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#ifdef HAVE_SYS_MKDEV_H
+#include <sys/mkdev.h>
+#endif
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif