Fixed wrong path delimiter in exe finding

Fixed wrong path delimiter in exe finding

On Windows XP3 in git bash
git clone git@github.com:octocat/Spoon-Knife.git
cd Spoon-Knife
git gui
menu Remote\Fetch from\origin
error: cannot spawn git: No such file or directory
error: could not run rev-list

if u run
git fetch --all
it worked normal in git bash or gitgui tools

In second version CreateProcess get 'C:\Git\libexec\git-core/git.exe' in
first version - C:/Git/libexec/git-core/git.exe and not executes (unix
slashes)

after fixing C:\Git\libexec\git-core\git.exe or
C:/Git/libexec/git-core\git.exe it works normal

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>