FreeBSD_HEAD_i386 - Build #1622 - Fixed

FreeBSD_HEAD_i386 - Build #1622 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/1622/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/1622/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/1622/console

Change summaries:

290541 by skra:
Make usermode variable the bool type. It's already used that way.

Suggested by:	kib
Approved by:	kib (mentor)

290540 by ngie:
printfloat_test and scanfloat_test need symbols from msun; these are automatically
provided on amd64, but not i386. Add libm to DPADD/LDADD to unbreak the i386
tinderbox

Pointyhat to: ngie
MFC after: 1 week
X-MFC with: r290538
Sponsored by: EMC / Isilon Storage Division

290539 by ngie:
Integrate tools/regression/lib/libc/string into the FreeBSD test suite
as lib/libc/tests/string

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division