File git-prompt of Package git

# In git versions < 1.7.12, this shell library was part of the
# git completion script.
#
# Some users rely on the __git_ps1 function becoming available
# when bash-completion is loaded.  Continue to load this library
# at bash-completion startup for now, to ease the transition to a
# world order where the prompt function is requested separately.
#
if [[ -e /usr/share/bash-completion/completions/git-prompt.sh ]]; then
	. /usr/share/bash-completion/completions/git-prompt.sh
fi