wayland: Build own version of core protocol

Since we are loading shared objects dynamically, build our own version of the
core protocol symbols, so that we in the future can include protocol
extensions.

Makefile.in

@@ -3,6 +3,7 @@
 top_builddir = .
 srcdir  = @srcdir@
 objects = build
+gen = gen
 prefix = @prefix@
 exec_prefix = @exec_prefix@
 bindir	= @bindir@
@@ -31,6 +32,8 @@ WINDRES	= @WINDRES@
 
 TARGET  = libSDL2.la
 OBJECTS = @OBJECTS@
+GEN_HEADERS = @GEN_HEADERS@
+GEN_OBJECTS = @GEN_OBJECTS@
 VERSION_OBJECTS = @VERSION_OBJECTS@
 
 SDLMAIN_TARGET = libSDL2main.a
@@ -39,6 +42,8 @@ SDLMAIN_OBJECTS = @SDLMAIN_OBJECTS@
 SDLTEST_TARGET = libSDL2_test.a
 SDLTEST_OBJECTS = @SDLTEST_OBJECTS@
 
+WAYLAND_SCANNER = @WAYLAND_SCANNER@
+
 SRC_DIST = *.txt acinclude Android.mk autogen.sh android-project build-scripts cmake cmake_uninstall.cmake.in configure configure.in debian docs include Makefile.* sdl2-config.cmake.in sdl2-config.in sdl2.m4 sdl2.pc.in SDL2.spec.in src test VisualC.html VisualC VisualC-WinRT Xcode Xcode-iOS
 GEN_DIST = SDL2.spec
 
@@ -48,6 +53,7 @@ RUN_CMD_CC     = @echo "  CC    " $@;
 RUN_CMD_CXX    = @echo "  CXX   " $@;
 RUN_CMD_LTLINK = @echo "  LTLINK" $@;
 RUN_CMD_RANLIB = @echo "  RANLIB" $@;
+RUN_CMD_GEN    = @echo "  GEN   " $@;
 LIBTOOL += --quiet
 endif
 
@@ -137,8 +143,8 @@ update-revision:
 
 .PHONY: all update-revision install install-bin install-hdrs install-lib install-data uninstall uninstall-bin uninstall-hdrs uninstall-lib uninstall-data clean distclean dist $(OBJECTS:.lo=.d)
 
-$(objects)/$(TARGET): $(OBJECTS) $(VERSION_OBJECTS)
-	$(RUN_CMD_LTLINK)$(LIBTOOL) --tag=CC --mode=link $(CC) -o $@ $(OBJECTS) $(VERSION_OBJECTS) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LT_LDFLAGS)
+$(objects)/$(TARGET): $(GEN_HEADERS) $(GEN_OBJECTS) $(OBJECTS) $(VERSION_OBJECTS)
+	$(RUN_CMD_LTLINK)$(LIBTOOL) --tag=CC --mode=link $(CC) -o $@ $(OBJECTS) $(GEN_OBJECTS) $(VERSION_OBJECTS) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LT_LDFLAGS)
 
 $(objects)/$(SDLMAIN_TARGET): $(SDLMAIN_OBJECTS)
 	$(RUN_CMD_AR)$(AR) cru $@ $(SDLMAIN_OBJECTS)
@@ -200,6 +206,7 @@ uninstall-data:
 
 clean:
 	rm -rf $(objects)
+	rm -rf $(gen)
 	if test -f test/Makefile; then (cd test; $(MAKE) $@); fi
 
 distclean: clean