configure: Do not explicitly set Oy for msvc/icl

It is implied by O1 or O2, both of which are required to build libav
with msvc/icl.  Silences warnings when targeting x64 with icl.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
configure: Do not omit frame pointers for msvc/icl debug builds

Because O1 or O2 are required to build libav with msvc/icl, this must be
explicitly set instead of just omitting Oy.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Merge commit '9f4a16c52ea8f2383244587ea4cb534fe7f6da49'

* commit '9f4a16c52ea8f2383244587ea4cb534fe7f6da49':
  configure: Do not explicitly set Oy for msvc/icl

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  configure: Do not omit frame pointers for msvc/icl debug builds

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