Set IDRIS_ENABLE_STATS in config.mk instead of in idris_stats.h. stats are not supported on Arduino. Also make sure that when IDRIS_ENABLE_STATS is not set, the idris_stats.h does not pull in time.h as this header is not available on the Arduino platform.
If EXIT_SUCCESS and EXIT_FAILURE are not defined (as is the case on Arduino), explicitly define them using standard values (EXIT_SUCCESS == 0, EXIT_FAILURE == 1). In the long term the RTS should be modified to not call exit directly at all since it does not make sense on embedded platforms. The calls to exit(EXIT_SUCCESS) and exit(EXIT_FAILURE). Should be replaced by macros that do something sensible on the platform.
Added rts/arudino/idris_main.c. It is similar to the standard idris_main.c except it does not attempt to handle argv/argc and it also calls the Arduino init() function.

Additionally, all the rts .c files are now included in the data-files section of the idris.cabal file. When using Idris to cross-compile, we need to recompile the RTS for the target platform. We do not know what platforms might be targeted in advance, so we need to have all the RTS source files available at compile time.
Merge remote-tracking branch 'upstream/master' into fix/master/arduino
Merge branch 'master' of https://github.com/idris-lang/Idris-dev into fix/master/arduino
Add -DIDRIS_ENABLE_STATS to CodegenC. Add missing #ifdef IDRIS_ENABLED_STATS in rts/idris_gc.c.
Merge pull request #1398 from stepcut/fix/master/arduino

Fix/master/arduino