added SDL tests

[glpixels] / Makefile.sdl2

obj = sdl2pixels.o
bin = sdl2pixels

CFLAGS = -pedantic -Wall -g -O3 `sdl2-config --cflags`
LDFLAGS = `sdl2-config --libs` -lm

$(bin): $(obj)
        $(CC) -o $@ $(obj) $(LDFLAGS)

.PHONY: clean
clean:
        rm -f $(obj) $(bin)