clients: Remove superfluous #includes

In particular window.c and many clients were including glib.h without
using it and without the right cflags.

clients/eventdemo.c

@@ -34,7 +34,6 @@
 #include <stdlib.h>
 
 #include <cairo.h>
-#include <glib.h>
 
 #include "window.h"
 

clients/flower.c

@@ -25,13 +25,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <fcntl.h>
-#include <unistd.h>
 #include <math.h>
 #include <time.h>
 #include <cairo.h>
 #include <sys/time.h>
-#include <glib.h>
 
 #include <linux/input.h>
 #include <wayland-client.h>

clients/gears.c

@@ -26,11 +26,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <fcntl.h>
-#include <unistd.h>
 #include <math.h>
 #include <time.h>
-#include <glib.h>
 
 #include <GL/gl.h>
 #include <EGL/egl.h>

clients/smoke.c

@@ -25,12 +25,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <fcntl.h>
-#include <unistd.h>
 #include <math.h>
 #include <time.h>
 #include <cairo.h>
-#include <glib.h>
 
 #include <wayland-client.h>
 #include "window.h"

clients/terminal.c

@@ -31,7 +31,6 @@
 #include <pty.h>
 #include <ctype.h>
 #include <cairo.h>
-#include <glib.h>
 #include <sys/epoll.h>
 
 #include <wayland-client.h>

clients/window.c

@@ -34,7 +34,6 @@
 #include <assert.h>
 #include <time.h>
 #include <cairo.h>
-#include <glib.h>
 #include <sys/mman.h>
 #include <sys/epoll.h>