Add --enable-macosx-package-signing

Change-Id: I355158f6cb584d252a21dfbce6e7cea6c70bba99
Make test-install work also in the non-release-build case

In the (default) --disable-release-build case the -p option to
make_installer.pl should be "LibreOffice_Dev", not "LibreOffice". See
instsetoo_native/util/openoffice.lst.in.

Also, the pathname passed to solenv/bin/macosx-codesign-app-bundle
needs to adapt to ENABLE_RELEASE_BUILD, either LibreOffice.app or
LibreOfficeDev.app.

Change-Id: If2b8efee096339f9c0cf52e663826d0086b1e35e