launcher: Add sysmacros.h include for major()

glibc 2.25 produces a warning when sysmacros.h is not directly included
but major() is used, as it is intended to be moved to sysmacros.h and
only there. Include it to keep the build happy.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Emilio Pozuelo Monfort <emilio.pozuelo@collabora.co.uk>

libweston/launcher-direct.c

@@ -33,6 +33,7 @@
 #include <unistd.h>
 #include <signal.h>
 #include <sys/stat.h>
+#include <sys/sysmacros.h>
 #include <sys/ioctl.h>
 #include <linux/vt.h>
 #include <linux/kd.h>

libweston/launcher-logind.c

@@ -35,6 +35,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
+#include <sys/sysmacros.h>
 #include <systemd/sd-login.h>
 #include <unistd.h>
 

libweston/launcher-weston-launch.c

@@ -34,6 +34,7 @@
 #include <errno.h>
 #include <signal.h>
 #include <sys/socket.h>
+#include <sys/sysmacros.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/uio.h>