screenshooter: Only link to $(CLIENT_LIBS) not libtoytoolkit.la

This application doesn't use toytoolkit, so don't link to it.  We have to
add a copy of xmalloc, to link without toytoolkit.

clients/Makefile.am

@@ -109,8 +109,10 @@ weston_flower_LDADD = libtoytoolkit.la
 weston_screenshooter_SOURCES =			\
 	screenshot.c				\
 	screenshooter-protocol.c		\
-	screenshooter-client-protocol.h
+	screenshooter-client-protocol.h		\
-weston_screenshooter_LDADD = libtoytoolkit.la
+	../shared/os-compatibility.c		\
+	../shared/os-compatibility.h
+weston_screenshooter_LDADD = $(CLIENT_LIBS)
 
 weston_terminal_SOURCES = terminal.c
 weston_terminal_LDADD = libtoytoolkit.la -lutil

clients/screenshot.c

@@ -20,7 +20,10 @@
  * OF THIS SOFTWARE.
  */
 
+#include "config.h"
+
 #include <stdint.h>
+#include <errno.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -75,6 +78,21 @@ display_handle_geometry(void *data,
 	}
 }
 
+static void *
+xmalloc(size_t size)
+{
+	void *p;
+
+	p = malloc(size);
+	if (p == NULL) {
+		fprintf(stderr, "%s: out of memory\n",
+			program_invocation_short_name);
+		exit(EXIT_FAILURE);
+	}
+
+	return p;
+}
+
 static void
 display_handle_mode(void *data,
 		    struct wl_output *wl_output,
@@ -185,7 +203,7 @@ write_png(int width, int height)
 
 	buffer_stride = width * 4;
 
-	data = malloc(buffer_stride * height);
+	data = xmalloc(buffer_stride * height);
 	if (!data)
 		return;