FlxGitSHA: fix "Type not found : NMEPreloader" compiler errors
FlxGitSHA: fix "Type not found : NMEPreloader" compiler errors

This happened only if Git was not available on the command line, which led to a "process creation failure" exception. This meant that the macro wouldn't return to the previous working directory, throwing off Lime's build process.

Caused by 00a39e6.

HaxeFlixel/flixel