Add support for HTTPS, Windows, and Linux builds to Makefile

Makefile

@@ -1,12 +1,29 @@
+
+CFLAGS = -ggdb
+LFLAGS =
+
+ifeq ($(shell uname -s),Linux)
+	EXT =
+else
+	EXT = .exe
+	LFLAGS += -lws2_32
+endif
+
+HTTPS ?= 0
+ifneq ($(HTTPS),0)
+	CFLAGS += -DHTTPS_ENABLED
+	LFLAGS += -lcrypto -lssl
+endif
+
 .PHONY: all clean example
 
-all: chttp.c chttp.h simple_client simple_server
+all: chttp.c chttp.h simple_client$(EXT) simple_server$(EXT)
 
 chttp.c chttp.h: $(wildcard src/*.c src/*.h) misc/amalg.py Makefile
 	python misc/amalg.py
 
-%: examples/%.c chttp.c chttp.h
-	gcc $< chttp.c -o $@ -ggdb
+%$(EXT): examples/%.c chttp.c chttp.h
+	gcc $< chttp.c -o $@ $(CFLAGS) $(LFLAGS)
 
 clean:
-	rm chttp.c chttp.h
+	rm chttp.c chttp.h simple_client simple_client.exe simple_server simple_server.exe