[git] replace hard linked-builtins with symlinks

git-post-install.sh

#!/bin/sh
BINDIR=/usr/local/bin/
EXECDIR=/usr/local/libexec/git-core
X=.exe
GIT=$BINDIR/git$X

for p in $(ls -1 $EXECDIR); \
do
	p=$EXECDIR/$p # already contains the postfix $X
	test $p -ef $GIT && \
		rm -f $p && \
		ln -s $GIT $p && \
		echo "symlinked $p"
done;