[kxml_compiler][bug]Invalid code could be generated when having attributes with different types

[martonmiklos]

Fixed on my qmake branch somewhere this point:
martonmiklos@33c4d25
just needs proper merge. Making issue here to make sure not to forget it.

[martonmiklos]

eagle.txt
Test XSD to reproduce (eagle::version and note::version attribute will fails to compile)