build: Drop wayland-scanner.mk

We now only have one Makefile.am so we don't need to keep these rules
in a separate file for sharing.

Makefile.am

@@ -8,7 +8,7 @@ BUILT_SOURCES =
 
 DISTCHECK_CONFIGURE_FLAGS = --disable-setuid-install
 
-EXTRA_DIST = weston.ini.in wayland-scanner.mk
+EXTRA_DIST = weston.ini.in
 
 weston.ini : $(srcdir)/weston.ini.in
 	$(AM_V_GEN)$(SED) \
@@ -944,4 +944,12 @@ CLEANFILES += $(man_MANS)
 
 
 wayland_protocoldir = $(top_srcdir)/protocol
-include $(top_srcdir)/wayland-scanner.mk
+
+%-protocol.c : $(wayland_protocoldir)/%.xml
+	$(AM_V_GEN)$(wayland_scanner) code < $< > $@
+
+%-server-protocol.h : $(wayland_protocoldir)/%.xml
+	$(AM_V_GEN)$(wayland_scanner) server-header < $< > $@
+
+%-client-protocol.h : $(wayland_protocoldir)/%.xml
+	$(AM_V_GEN)$(wayland_scanner) client-header < $< > $@

wayland-scanner.mk

-%-protocol.c : $(wayland_protocoldir)/%.xml
-	$(AM_V_GEN)$(wayland_scanner) code < $< > $@
-
-%-server-protocol.h : $(wayland_protocoldir)/%.xml
-	$(AM_V_GEN)$(wayland_scanner) server-header < $< > $@
-
-%-client-protocol.h : $(wayland_protocoldir)/%.xml
-	$(AM_V_GEN)$(wayland_scanner) client-header < $< > $@