configure: Separate commonalities in msvc and icl flags

Allows for easier handling of flags that may be specific to icl or msvc.
Furthermore, simplify the handling of warnings and remarks thanks to
icl's support of -Wall on Windows.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
configure: icl: Merge -Qdiag-error parameters

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
indeo4: expand allowed quantiser range

Indeo 4 has quantiser range 0-31 instead of 0-23 for Indeo 5, and clipping
quantiser leads to incorrect quantisation and DC prediction on low-quality
videos.

This fixes bug 259.
Merge commit '14fb9d3d8ccf5f50180aabdb1afe8b570fea3d28'

* commit '14fb9d3d8ccf5f50180aabdb1afe8b570fea3d28':
  configure: Separate commonalities in msvc and icl flags

Conflicts:
	configure

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

* qatar/master:
  indeo4: expand allowed quantiser range
  configure: icl: Merge -Qdiag-error parameters

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avutil/crc: Dont limit CRC32 standard tables

Currently, standard tables like AV_CRC_32_IEEE and such are being generated (or
provided in case the user compiles with hardcoded tables) with only 257 elements.
We're missing a considerable boost in performance by not making them with a size
of 1024 elements instead.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
jpeg2000dec: optimize dequantization_float()

4700 -> 2700 cycles (sandybridge  i7)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
jpeg2000dec: optimize dequantization_int()

4400->2800 cycles

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