os.Rename in init fails in Windows for various reasons. One of them
is the temporary files extracted from NDK, OpenAL archives. For
some reason, some of them have read-only properties.
(golang/go#12212)
> gomobile init
gomobile: rename
C:\Users\foo\pkg\gomobile\work-427911983\openal\include\AL
C:\Users\foo\pkg\gomobile\android-ndk-r10e\arm\sysroot\usr\include\AL:
Access is denied.
We reset the read-only bits of all the extracted files.
Change-Id: Ib958cbedf1b7527ecb5b9318f23fe9437dc7c241
Reviewed-on: https://go-review.googlesource.com/12970
Reviewed-by: David Crawshaw <crawshaw@golang.org>
f9f0ffafe3