More GNUmakefile cleanups.

With the normalization of magimail's Makefile,
we can further simplify this logic.

Integrate the WWW logic into GNUmakefile.common.

Remove the custom `Makefile.sunos` files: just
use a conditional in the Makefile.

Signed-off-by: Dan Cross <patchdev@fat-dragon.org>

utils/magichat/GNUmakefile

@@ -0,0 +1,27 @@
+CC=cc
+
+DEPS = main.c
+
+OBJ = main.o
+
+OS = $(shell uname -s)
+ifeq ($(OS), SunOS)
+	EXTRA_LIBS = -lsocket
+endif
+%.o: %.c $(DEPS)
+	$(CC) -c -o $@ $< $(CFLAGS)
+
+JSMN = ../../deps/jsmn/libjsmn.a
+
+all: magichat
+
+$(JSMN):
+	cd ../../deps/jsmn/ && $(MAKE)
+
+magichat: $(OBJ) $(JSMN)
+	$(CC) -o magichat -o $@ $^ $(LDFLAGS) $(EXTRA_LIBS)
+
+.PHONY: clean
+
+clean:
+	rm -f $(OBJ) magichat