Problem: Build system for qt-android is out of date.
Solution: Update it.
Merge pull request #793 from jemc/master

Problem: Build system for qt-android is out of date.
Problem: No code-accessible contract for length of a zuuid_str
Solution: Add the ZUUID_STR_LEN constant to zuuid.h
Resolves #777
Merge pull request #795 from jemc/master

Problem: No code-accessible contract for length of a zuuid_str