Experiment with splitting modules and config.h flags again.

[planetis-m]

raysan5/raylib#4193

[planetis-m]

build.zig doesn't seem to bother with commented out defines (disabled by default). It only overrides already defined ones... The same can be achieved with {.passC: "-DSUPPORT...=1".} or by parsing config.h with raylib_parser and generating:

when defined(rlCustomFrameControl):
  {.passC: "-DSUPPORT_CUSTOM_FRAME_CONTROL=1".}

Moreover as discussed in #bindings-dev you can't undef from the command line defines in source code.