MFC r290572,r290646,r290848,r290849:

r290572:

Integrate tools/regression/lib/libc/gen into the FreeBSD test suite
as lib/libc/tests/gen

The code in test-fnmatch that was used for generating:

- bin/sh/tests/builtins/case2.0
- bin/sh/tests/builtins/case3.0

has been left undisturbed. The target `make sh-tests` has been moved over
from tools/regression/lib/libc/gen/Makefile to
lib/libc/tests/gen/Makefile and made into a PHONY target

case2.0 and case3.0 test input generation isn't being done automatically.
This needs additional discussion.

Sponsored by: EMC / Isilon Storage Division

r290646:

Add missing licensing boilerplate to test-fnmatch.c

Carry over licensing author info from fnmatch_test.c (jilles@)

Sponsored by: EMC / Isilon Storage Division

r290848:

Fix -Wunused warnings

Sponsored by: EMC / Isilon Storage Division

r290849:

Fix -Wmissing-braces warnings by adding braces around all the
testcase inputs

Sponsored by: EMC / Isilon Storage Division