This fixes an issue where the Git wrapper would terminate upon Ctrl+C,
even in the case when its child process would *not* terminate.
Note: while the original intention was to fix running Git Bash in
ConsoleZ, the bug fix applies also to running
C:\Program Files\Git\bin\bash -l -i
in a cmd window.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>