Fixed mrbtest result numbers

Removed gem libraries in mrbc

add mrb_check_hash_type

Remove compiler warnings

Make conf.bins work for cross compiled deps as well as the host.

Host's mrbc file should be used when cross-compiling mrbtest.c

Added conf.bins for defining bulding binaries

Added s flag to ar command

Strict runtime error checking

Remove redundant null checks.

Add check for using cdump with DISABLE_STDIO option.

Export Array#clear in array.h

Added gem :github option