Qt: do not use uninitialized value
mft: Use the proper windows version define
libmp4: Use a portable format specified for uintmax_t
contrib: flac: bump to 1.3.1

CVE-2014-8962
CVE-2014-9028
Qt: Avoid focus stealing of the tooltip on Win32

Close #12060
Ref #12084
contrib: correctly copy mac os aliases in package creation (close #12875)
hds: free mutexes and cond variables on all streams

Signed-off-by: Tristan Matthews <tmatth@videolan.org>