Fix 64-bitness option

Also, don't claim TDF would be doing 64-bit Windows builds.

Change-Id: I3abdb13cf7b29c6d249d49fd6f66ce1b9993d97e

distro-configs/LibreOfficeWin64.conf

---with-vendor=The Document Foundation
---enable-cl-x64
+--enable-64-bit
 --enable-postgresql-sdbc
 --disable-gtk
 --enable-scripting-beanshell