mjit.c: define __EXTENSIONS__ earlier

Another try of r62204 and r62192.

As far as I can see from solaris's signal.h and sys/procset.h, the only
possibility that causes the following error would be that sys/procset.h
is included without __EXTENSIONS__ and signal.h included it again but it
doesn't define procset_t.  Let's define __EXTENSIONS__ from first.

---
In file included from vm_core.h:87:0,
                 from mjit.c:85:
/usr/include/signal.h:77:29: error: unknown type name 'procset_t'
 extern int sigsendset(const procset_t *, int);
                             ^

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62211 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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