_NL_TIME_FIRST_WEEKDAY detection doesn't work w/ tarball: Bug #734897

Vala compiler flags set or detected in ./configure aren't properly
reflected when building from tarball because the .c files have already
been generated and distributed.  This change will always rebuild the
.c files when ./configure runs.  This also means Vala is a hard
requirement for California now (which is why the custom .vapi files
must now be distributed).

This also closes bug #726210.
Updated to 0.1.4