opusfile: bump 0.12

opusfile: bump 0.12

Changes since the v0.11 release:

    Fix stack overflow buffering out-of-sequence streams.
    Fix possible divide-by-zero.
    Fix issues with seeking in the win32 backend.
    Fix an issue where the seek algorithm could be confused by stream data changing between reads.
    Clean up compiler and scan-build warnings.
    Avoid use of the deprecated ftime() function which has Y2038 problems.
    Remove undefined behaviour memcpy(NULL) in op_read_native().
    Visual Studio project files updated for libogg 1.3.4 library name change.
    Various build systems updates.
    Various integration and testing environment improvements.

Signed-off-by: Eduardo Abinader <eduardoabinader@gmail.com>