2) protect some of the canadian cross targets with ifdef/endif
3) make configargs settable from the command line too (assignments augment
instead of replace previous values)
to test-build.mk as RELEASE_TAG.
* test-build.mk (configargs): New variable containing arguments to
pass to configure. Set to -with-gnu-as on mips-dec-ultrix.
(FLAGS_TO_PASS): Pass down RELEASE_TAG.
* config.guess: Use /bin/uname when checking -X argument on SCO,
to avoid invoking GNU uname which doesn't understand -X.
* build-all.mk: If canonhost is i386-unknown-sco3.2v4, change it
to i386-sco3.2v4. Set TARGETS and CFLAGS for i386-sco3.2v4.
(all-cygnus, native, build-cygnus): Make
$(canonhost)-stamp-3stage-done, not $(host)....
* test-build.mk (stamp-3stage-compared): Use tail +10c for
i386-sco3.2v4. Added else true to if command.
