[binutils-gdb] sim: allow the environment configure option everywhere

[sergiodj+buildbot@redhat.com]

*** TEST RESULTS FOR COMMIT 16f7876d71604f835aefe48f0bf230c028c05d99 ***

Author: Mike Frysinger <vapier@gentoo.org>
Branch: master
Commit: 16f7876d71604f835aefe48f0bf230c028c05d99

sim: allow the environment configure option everywhere

Currently ports have to call SIM_AC_OPTION_ENVIRONMENT explicitly in
order to make the configure flag available.  There's no real reason
to not allow this flag for all ports, so move it to the common sim
macro.  This way we get standard behavior across all ports too.