arm: Mangle external symbols properly in new vfp assembly files

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  arm: Mangle external symbols properly in new vfp assembly files

See: 47d57f24e35f0e9694c615b81511dde4cda95c72
Merged-by: Michael Niedermayer <michaelni@gmx.at>
avformat/aviobuf/ffio_init_context: set seekable automatically

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>