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/post-fx/Makefile

@@ -1,18 +0,0 @@
-EXEC = post-fx
-OBJ  = PostFX.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)