Fix finding ChangeLog when building

Keep the first optional argument of get_version.sh as "--strict" and
make the second the PROJECT_SOURCE_DIR plus trailing slash from
CMakeLists.txt

packaging/make_ubuntu.sh

@@ -14,7 +14,7 @@ else
 fi
 
 # Get version (and check that the repository is clean)
-VERSION=$(../get_version.sh --strict)
+VERSION=$(../get_version.sh --strict ../)
 if [ ! $? -eq 0 ]
 then
     echo >&2 "Error: get_version.sh failed!"