FreeBSD_HEAD - Build #3531 - Fixed

FreeBSD_HEAD - Build #3531 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD/3531/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD/3531/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD/3531/console

Change summaries:

290866 by bapt:
Regenerate locales after readding ISO8859-1 for locales that have ISO8859-15

Requested by:	arche

290865 by bapt:
Generate in the FreeBSD keyword when generating the Makefiles

290864 by bapt:
Add ISO8859-1 everywhere ISO8859-15 exists

290863 by bapt:
Allow to generate the locale when the source directory is not /usr/src

290862 by bapt:
Simplify a bit the aliases generation

290861 by trasz:
Doh, commit in a wrong directory.  Fix r290857.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation

290860 by bapt:
Remove unused variables to fix building world

290859 by bapt:
Rework locale-links to not make symlinks on directories but symlinks on files

The goal here is to make the upgrade seamless for users
Add aliases for zh_HK
Remove bad symlinks created by previous bad upgrade procedure.
Complete ObsoleteFiles.inc with more locales that have been removed