Fix special_case_handler to handle git add prev_CMakeLists.txt better

When using run_pro2cmake.py, it spawns multiple instances of
pro2cmake.py.
If more than 1 of the instances need to git add prev_CMakeLists.txt at
the same time, git add might fail due to the acquired index.lock.

The cleaner solution would be to use a file lock as a mutex, but that
requires an external pypi package.

Use a poor man solution of retrying the git add with a time delay for a
finite amount of times.

Change-Id: I2031f6e29ae499526cb4f1753e4387e7f4fab0ab
Reviewed-by: Qt CMake Build Bot
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

0 files changed, 0 insertions, 0 deletions