git-foreach: remove given/when
git-foreach: remove given/when

given/when issues warnings as of perl 5.18 and will likely change in
a future version.

Signed-off-by: Andrew Gregory <13115e38efea9b5bf08524f6765f5bb44291d47f@gmail.com>

andrewgregory/bin,andrewgregory/bin,andrewgregory/bin