src: Don't add COMPOSITOR_CFLAGS to AM_CPPFLAGS

It's a CFLAGS variable, not CPPFLAGS and we don't want to add it to every
target.  In particular we don't want anything leaking into weston-launch.

src/Makefile.am

@@ -5,15 +5,13 @@ AM_CPPFLAGS =					\
 	-DDATADIR='"$(datadir)"'		\
 	-DMODULEDIR='"$(moduledir)"'		\
 	-DLIBEXECDIR='"$(libexecdir)"'		\
-	-DXSERVER_PATH='"@XSERVER_PATH@"'	\
-	$(COMPOSITOR_CFLAGS)
+	-DXSERVER_PATH='"@XSERVER_PATH@"'
 
 weston_LDFLAGS = -export-dynamic
-weston_CFLAGS = $(GCC_CFLAGS)
-weston_LDADD =								\
-	$(COMPOSITOR_LIBS) $(DLOPEN_LIBS) -lm ../shared/libshared.la
+weston_CFLAGS = $(GCC_CFLAGS) $(COMPOSITOR_CFLAGS)
+weston_LDADD = $(COMPOSITOR_LIBS) $(DLOPEN_LIBS) -lm ../shared/libshared.la
 
-weston_SOURCES =			\
+weston_SOURCES =				\
 	compositor.c				\
 	compositor.h				\
 	screenshooter.c				\
@@ -64,7 +62,10 @@ x11_backend = x11-backend.la
 x11_backend_la_LDFLAGS = -module -avoid-version
 x11_backend_la_LIBADD = $(COMPOSITOR_LIBS) $(X11_COMPOSITOR_LIBS) \
 	../shared/libshared.la
-x11_backend_la_CFLAGS = $(X11_COMPOSITOR_CFLAGS) $(GCC_CFLAGS)
+x11_backend_la_CFLAGS =				\
+	$(COMPOSITOR_CFLAGS)			\
+	$(X11_COMPOSITOR_CFLAGS)		\
+	$(GCC_CFLAGS)
 x11_backend_la_SOURCES = compositor-x11.c
 endif
 
@@ -73,7 +74,10 @@ drm_backend = drm-backend.la
 drm_backend_la_LDFLAGS = -module -avoid-version
 drm_backend_la_LIBADD = $(COMPOSITOR_LIBS) $(DRM_COMPOSITOR_LIBS) \
 	../shared/libshared.la
-drm_backend_la_CFLAGS = $(DRM_COMPOSITOR_CFLAGS) $(GCC_CFLAGS)
+drm_backend_la_CFLAGS =				\
+	$(COMPOSITOR_CFLAGS)			\
+	$(DRM_COMPOSITOR_CFLAGS)		\
+	$(GCC_CFLAGS)
 drm_backend_la_SOURCES =			\
 	compositor-drm.c			\
 	tty.c					\
@@ -90,7 +94,10 @@ wayland_backend = wayland-backend.la
 wayland_backend_la_LDFLAGS = -module -avoid-version
 wayland_backend_la_LIBADD = $(COMPOSITOR_LIBS) $(WAYLAND_COMPOSITOR_LIBS) \
 	../shared/libshared.la
-wayland_backend_la_CFLAGS = $(WAYLAND_COMPOSITOR_CFLAGS) $(GCC_CFLAGS)
+wayland_backend_la_CFLAGS =			\
+	$(COMPOSITOR_CFLAGS)			\
+	$(WAYLAND_COMPOSITOR_CFLAGS)		\
+	$(GCC_CFLAGS)
 wayland_backend_la_SOURCES = compositor-wayland.c
 endif
 
@@ -106,7 +113,7 @@ if ENABLE_XSERVER_LAUNCHER
 xserver_launcher = xserver-launcher.la
 xserver_launcher_la_LDFLAGS = -module -avoid-version
 xserver_launcher_la_LIBADD = $(XSERVER_LAUNCHER_LIBS)
-xserver_launcher_la_CFLAGS = $(GCC_CFLAGS)
+xserver_launcher_la_CFLAGS = $(GCC_CFLAGS) $(COMPOSITOR_CFLAGS)
 xserver_launcher_la_SOURCES =			\
 	xserver-launcher.c			\
 	xserver-protocol.c			\
@@ -120,7 +127,7 @@ desktop_shell = desktop-shell.la
 desktop_shell_la_LDFLAGS = -module -avoid-version
 desktop_shell_la_LIBADD = $(COMPOSITOR_LIBS)	\
 	../shared/libshared.la
-desktop_shell_la_CFLAGS = $(GCC_CFLAGS)
+desktop_shell_la_CFLAGS = $(GCC_CFLAGS) $(COMPOSITOR_CFLAGS)
 desktop_shell_la_SOURCES =			\
 	shell.c					\
 	desktop-shell-protocol.c		\
@@ -131,7 +138,7 @@ if ENABLE_TABLET_SHELL
 tablet_shell = tablet-shell.la
 tablet_shell_la_LDFLAGS = -module -avoid-version
 tablet_shell_la_LIBADD = $(COMPOSITOR_LIBS)
-tablet_shell_la_CFLAGS = $(GCC_CFLAGS)
+tablet_shell_la_CFLAGS = $(GCC_CFLAGS) $(COMPOSITOR_CFLAGS)
 tablet_shell_la_SOURCES =			\
 	tablet-shell.c				\
 	tablet-shell-protocol.c			\