installer_cross: No git checkout after update-po
All the following is relevant in snapshot builds only:
installer_cross builds never do 'git checkout' for translations even though it introduces changes by running 'update-po'. When multiple installers are built (e.g. by ./build_all_installers.sh), latter ones get the sources modified by former ones. Most notable result of this is that the sources get flagged as "modified" in the version string.
Syntax error when GITREVERT is empty: "if test $GITREVERT = true" -> "if test = true"
- Syntax fixed