movenc: Remove an outdated comment

QuickTime does support files with an empty initial movie
these days.

Signed-off-by: Martin Storsjö <martin@martin.st>
movenc: Avoid leaking locally allocated data when returning on errors

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit '95a449d3ce8e15522df47a80a8a4593ea5c2b1bb'

* commit '95a449d3ce8e15522df47a80a8a4593ea5c2b1bb':
  movenc: Remove an outdated comment

Conflicts:
	libavformat/movenc.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '8cb7b7b461b52898765b38e3eff68c0ce88347f3'

* commit '8cb7b7b461b52898765b38e3eff68c0ce88347f3':
  movenc: Avoid leaking locally allocated data when returning on errors

Conflicts:
	libavformat/movenc.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Remove fminf() emulation.

The emulation is unused and causes compilation trouble on systems
where fminf() is defined in <math.h> but missing from libm.
This should fix compilation on Debian powerpcspe.