* Treat spir-v.xml as utf-8
Treat the input file as utf-8, and configure the XML parser to use
the utf-8 encoding.
The Chromium build was breaking when trying to parse the XML
file as ASCII.
* Use Python io.open
Try to fix the android-ndk-build flow. It seems to be using
an old Python. For example, Python 2.6 builtin function open()
did not support the 'encoding' keyword argument. But its io.open
method did support it.
