The textconv filters may include multiple arguments and may make use
of unix shell features. To maintain compatibility with 'git blame'
ensure these commands are passed through bash.
Reported-by: NKirill Smelkov <kirr@landau.phys.spbu.ru>
Signed-off-by: NMatthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: NPat Thoyts <patthoyts@users.sourceforge.net>