common.mk: moved macros to mjit_config.h
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62488 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
common.mk: moved macros to mjit_config.h
mjit_config.h from XCFLAGS.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62488 b2dd03c8-39d4-4d8f-98ff-823fe69b080e