This helps to avoid unnecessary updates on the source-registry side.

It could happen that the child sources were disabled, but when they
were claimed again they were not enabled, which made them hidden
for a user.

The former calls the later internally, but apart of it it does few
useful things too, like removing the disk file, thus it is not
used the next start again.

It could place locale files into $PREFIX/locale, instead of $PREFIX/share/locale.
The change follows bug 703732.

It could happen that the test program failed due to missing CFLAGS
or even LIBS, thus it could give incorrect results.