QStorageInfo is completely broken with NDK r10e

The QStorageInfo dos not return correct info, bytesFree(), bytesTotal(), bytesAvailable() all returns 0.

This is the same issue as QTBUG-69173.

As I explained in QTBUG-69173, the main cause is QStorageInfo is using 

_PATH_MOUNTED by include <paths.h>, but the value is defined differently in NDK r10e and more recent NDK.

in <NDK-r10e>/platforms/android-16/arch-arm/usr/include/paths.h (all other api levels has the same value)

#define _PATH_MOUNTED "/etc/mtab"

in <recent-NDK>/sysroot/usr/include/paths.h

#define _PATH_MOUNTED "/proc/mounts"

Since qt installer binary is built with NDK r10e, we are stuck with "/etc/mtab".

The problem is most android devices do not have "/etc/mtab", I have tested this with Google's Nexus 7, and it certainly does not have /etc/mtab.

QStorageInfo used to work normally, but suddenly failed with newer Qt release. The fix should be simple, just hardcode _PATH_MOUNTED to "/proc/mounts", something like:

#ifdef Q_OS_ANDROID
#undef _PATH_MOUNTED
#define_PATH_MOUNTED "/proc/mounts"
#endif

But since the developer keep resist making the changes, maybe it is time to move NDK to a more recent release?