Factor out SSI and WS code from http.c
HTTP + WS are enabled by default, but MQTT is built without HTTP
support as a compilation test.
PUBLISHED_FROM=925ed9a55abb193ed7deac1c9675a0e5b35dca50
"#if FOO" still works with simple -DFOO, but gives more flexibility.
Specifically, if user expressed no preference (FOO is not defined),
we can apply reasonable defaults (this is the legitimate use of ifdef).
In short, from now on, please use
#if MG_ENABLE_FOO
instead of
#ifdef MG_ENABLE_FOO
Since we are all used to #ifdef, this change also adds a precommit check
to police this. Specifically, in *.h and *.c files that are Copyright Cesanta,
"ifdef" and "if defined()" are not allowed to be used with macros that contain
ENABLE or DISABLE, unless the like also contains "ifdef-ok".
Hence, if you are sure you want to use ifdef, use this:
#ifdef MG_ENABLE_FOO /* ifdef-ok */
PUBLISHED_FROM=9be829448f53cff575d6cae8b9945fb12531c15a
Make restful_server and netcat examples compilation tests:
- netcat doesn't use HTTP, compile it with MG_DISABLE_HTTP
- restful_server doesn't use websocket, compile it with
MG_DISABLE_HTTP_WEBSOCKET
h/t @labourcier, cesanta/mongoose#665
PUBLISHED_FROM=4494ac3cbd81e8314beb557ab301b4b44c4afb89
