Use erlang:halt/0 for c_src.mk

* erlang:halt/0 is much faster than init:stop/0 to terminate
  execution (no wait time)
Merge branch 'jj1bdx-c_src-fix' of git://github.com/jj1bdx/erlang.mk
Add support for excluding erl files
Merge branch 'erlc-excl' of git://github.com/efcasado/erlang.mk