configure.ac was setting VERBOSE=YES/NO when really
we use verbose=t or verbose=

Change-Id: I47aee8d177cb2d788a62ecdbbb9cc3695c2bb299
Reviewed-on: https://gerrit.libreoffice.org/17634Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>