Ruby

mjit.c: try changing the order of includes

Hoping to fix the AIX's build failure like:

In file included from ./include/ruby/defines.h:139:0,
from ./include/ruby/ruby.h:29,
from ./include/ruby.h:33,
from internal.h:15,
from mjit.c:81:
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/4.8.1/include-fixed/unistd.h:939:14: error: conflicting types for 'ftruncate64'
extern int ftruncate64(int, off64_t);
^
In file included from ./include/ruby/defines.h:139:0,
from ./include/ruby/ruby.h:29,
from ./include/ruby.h:33,
from internal.h:15,
from mjit.c:81:
/opt/freeware/lib/gcc/powerpc-ibm-aix7.1.0.0/4.8.1/include-fixed/unistd.h:937:14: note: previous declaration of 'ftruncate64' was here
extern int ftruncate(int, off_t);
^

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62227 b2dd03c8-39d4-4d8f-98ff-823fe69b080e