On Windows/MinGW the value of $(PWD) is not always set to the correct "pwd" value.

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 results into errors when building the project and zipping the assets.
Merge pull request #2743 from falcon4ever/bugfix-android-projectpath

Android building script error when building from Windows