There have been two problems:
* GLFW itself was compiled with the definitions for compiling
_against_ GLFW (fixed by removing requirement for external glfw)
* rglfw.c was being compiled as C code, although it includes
Objective C files.
This _might_ break the Windows build, needs to be checked.
Fixes#391, but as noted I'd prefer though a separate source directory
and build script for GLFW.
Feature macros need to be defined before #including any headers,
preferably through the build system, but this is good enough.
Fixes a compile error on my fork's Travis CI.
Corrected Android processing for some inputs (BACK button, VOLUME
buttons)
Redesigned Gestures system (some work still required)
SetEnabledGestures() - Only support desired gestures (requires some
review)
