egl: add missing #include

close() is in <unistd.h>

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

src/egl/main/egldisplay.c

@@ -35,6 +35,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 #include <fcntl.h>
 #include "c11/threads.h"
 #include "util/u_atomic.h"