Better error reporting in mktargets.py
Fix Android build setting minSdkVersion

Beside changing line endings in (see: 973a16) it's also
required to set a minimum Sdk version in the manifest
Merge pull request #568 from ylatuya/android

Fix Android build setting minSdkVersion
Merge pull request #565 from varunbpatil/errstr

Better error reporting in mktargets.py