Fix new build script so it runs under Windows
Fix new build script so it runs under Windows

Change-Id: Id79b56398a86fe6b0158463d7794eedbe9f17886
Reviewed-on: http://gerrit.dmdirc.com/2021
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <711c73f64afdce07b7e38039a96d2224209e9a6c@dmdirc.com>

DMDirc/Plugins,csmith/DMDirc-Plugins,csmith/DMDirc-Plugins,DMDirc/Plugins,DMDirc/Plugins,DMDirc/Plugins,csmith/DMDirc-Plugins,DMDirc/Plugins,csmith/DMDirc-Plugins,csmith/DMDirc-Plugins