Drop ENABLE_FEATURE_MAKE_EXTENSIONS

[illiliti]

I understand the reasoning behind it, but since we already have a way to control it at runtime, i don't see why do we need compile time option.

[rmyorston]

Compiling with ENABLE_FEATURE_MAKE_EXTENSIONS 0 isn't of much practical use but I find the conditional compilation useful during development:

• It helps to keep track of the purpose of all that extra code.
• Things aren't yet entirely stable (and may never be!). Sometimes it's necessary to change an extension into a POSIX feature and vice versa.
• It serves to remind me that the code for each extension should somewhere have the ability to turn it off at runtime.

[illiliti]

Fair point. Closing