configure.ac: Don't link weston to cairo or image libraries

We were pulling in cairo and the image loading libraries through libshared.
Split out libshared into a core libshared and a libshared-cairo that
pulls in the extra libraries.

shared/Makefile.am

@@ -1,15 +1,30 @@
-noinst_LTLIBRARIES = libshared.la
+noinst_LTLIBRARIES = libshared.la libshared-cairo.la
 
-libshared_la_LIBADD = $(SHARED_LIBS)
-AM_CPPFLAGS = $(SHARED_CFLAGS)
-AM_CFLAGS = $(GCC_CFLAGS)
+libshared_la_CFLAGS = $(GCC_CFLAGS)
 
 libshared_la_SOURCES =				\
 	config-parser.c				\
 	option-parser.c				\
-	image-loader.c				\
 	config-parser.h				\
 	os-compatibility.c			\
-	os-compatibility.h			\
+	os-compatibility.h
+
+libshared_cairo_la_CFLAGS =			\
+	$(GCC_CFLAGS)				\
+	$(PIXMAN_CFLAGS)			\
+	$(CAIRO_CFLAGS)				\
+	$(PNG_CFLAGS)				\
+	$(WEBP_CFLAGS)
+
+libshared_cairo_la_LIBADD =			\
+	$(PIXMAN_LIBS)				\
+	$(CAIRO_LIBS)				\
+	$(PNG_LIBS)				\
+	$(WEBP_LIBS)				\
+	$(JPEG_LIBS)
+
+libshared_cairo_la_SOURCES =			\
+	$(libshared_la_SOURCES)			\
+	image-loader.c				\
 	cairo-util.c				\
 	cairo-util.h

shared/cairo-util.h

@@ -23,6 +23,8 @@
 #ifndef _CAIRO_UTIL_H
 #define _CAIRO_UTIL_H
 
+#include <pixman.h>
+
 void
 surface_flush_device(cairo_surface_t *surface);
 
@@ -87,4 +89,7 @@ enum theme_location {
 enum theme_location
 theme_get_location(struct theme *t, int x, int y, int width, int height, int flags);
 
+pixman_image_t *
+load_image(const char *filename);
+
 #endif

shared/config-parser.h

@@ -23,8 +23,6 @@
 #ifndef CONFIGPARSER_H
 #define CONFIGPARSER_H
 
-#include <pixman.h>
-
 enum config_key_type {
 	CONFIG_KEY_INTEGER,		/* typeof data = int */
 	CONFIG_KEY_UNSIGNED_INTEGER,	/* typeof data = unsigned int */
@@ -71,8 +69,5 @@ int
 parse_options(const struct weston_option *options,
 	      int count, int argc, char *argv[]);
 
-pixman_image_t *
-load_image(const char *filename);
-
 #endif /* CONFIGPARSER_H */