MFC r315032-r315036, r315039, r315041

r315032:
Increase WARNS for iconv tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by: ngie
Sponsored by: Spectra Logic Corporation
Differential Revision: https://reviews.freebsd.org/D9933

r315033:
Increase WARNS for nss tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by: ngie
Sponsored by: Spectra Logic Corporation
Differential Revision: https://reviews.freebsd.org/D9933

r315034:
Document that the msun tests require WARNS=0

ATF tests have a default WARNS of 0, unlike other usermode programs. This
change is technically a noop, but it documents that the msun tests don't
work with any warnings enabled, at least not on all architectures.

Reviewed by: ngie
Sponsored by: Spectra Logic Corporation
Differential Revision: https://reviews.freebsd.org/D9933

r315035:
Increase WARNS for libcrypt tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by: ngie, julian
Sponsored by: Spectra Logic Corporation
Differential Revision: https://reviews.freebsd.org/D9933

r315036:
Increase WARNS for libmp tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by: ngie, julian
Sponsored by: Spectra Logic Corporation
Differential Revision: https://reviews.freebsd.org/D9933

r315039:
Increase WARNS for libutil tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by: ngie, julian
Sponsored by: Spectra Logic Corporation
Differential Revision: https://reviews.freebsd.org/D9933

r315041:
Increase WARNS for pw tests

ATF tests have a default WARNS of 0, unlike other usermode programs.

Reviewed by: ngie, julian
Sponsored by: Spectra Logic Corporation
Differential Revision: https://reviews.freebsd.org/D9933

MFC r289172,r290254:

r289172:

Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and
netbsd-tests.test.mk (r289151)

- Eliminate explicit OBJTOP/SRCTOP setting
- Convert all ad hoc NetBSD test integration over to netbsd-tests.test.mk
- Remove unnecessary TESTSDIR setting
- Use SRCTOP where possible for clarity

r290254:

Remove unused variable (SRCDIR)

MFC r269534:

Integrate lib/libmp into the build/kyua

- Remove the .t wrapper
- Fix -Wreturn-type warnings with clang

This change has been tested on amd64/i386

Phabric: D530
Reviewed by: jmmv
Approved by: jmmv (co--mentor)
MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

MFC note: src.opts.mk in the original commit was changed to
bsd.own.mk.

Integrate lib/libmp into the build/kyua

- Remove the .t wrapper
- Fix -Wreturn-type warnings with clang

This change has been tested on amd64/i386

Phabric: D530
Reviewed by: jmmv
Approved by: jmmv (co-mentor)
MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division