FS#25 - Change sf::PostFx to a more general purpose pixel shader class (sf::Shader)

Updated the PostFx sample, renamed to Shader
Renamed all the static X::CanUseX() functions to X::IsAvailable() to make the API more consistent
Moved .def files from /build/VC200X to /src in CSFML
Minors fixes in CSFML

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1258 4e206d99-4929-0410-ac5d-dfc041789085

samples/shader/Makefile

@@ -0,0 +1,18 @@
+EXEC = shader
+OBJ  = Shader.o
+
+all: $(EXEC)
+
+post-fx: $(OBJ)
+	$(CC) $(LDFLAGS) -o $(EXECPATH)/$@ $(OBJ) -lsfml-graphics -lsfml-window -lsfml-system
+
+%.o: %.cpp
+	$(CC) -o $@ -c $< $(CFLAGS)
+
+.PHONY: clean mrproper
+
+clean:
+	@rm -rf *.o
+
+mrproper: clean
+	@rm -rf $(EXECPATH)/$(EXEC)