Android building script error when building from Windows

When building an Android project on Windows (using MinGW), the value of $(PWD) is not always set to the correct path.

In a few cases it is set to a Windows style path (C:\openFrameworks\apps\devApps\VboExample) instead of a Unix style (/c/openFrameworks/apps/devApps/VboExample) one. 

This will cause the buildscript to fail (especially when it is trying to change the directory and zip the assets on line 518).