Mac distro config is always 64 bits these days & remove --with-vendor

Change-Id: I0f0f4c8b511335ec2a6bf69c054cff8aaca8170a

distro-configs/LibreOfficeMacOSX.conf

---with-vendor=The Document Foundation
 --enable-epm
 --enable-scripting-beanshell
 --enable-scripting-javascript

distro-configs/LibreOfficeMacOSX64.conf

---with-vendor=The Document Foundation
---enable-64-bit
---enable-epm
---enable-scripting-beanshell
---enable-scripting-javascript
---enable-ext-nlpsolver
---enable-extension-integration
---enable-online-update
---without-system-postgresql
---disable-gtk
---with-help
---with-myspell-dicts
---with-package-format=dmg
---with-macosx-sdk=10.8
---with-macosx-version-min-required=10.8