ffplay: drop redundant NULL sws_freeContext() check in stream_close()

sws_freeContext() already checks for NULL, simplify.
lavf/segment: use correct spelling and value for EXT-X-ALLOW-CACHE tag

Replace wrong "EXT-X-ALLOWCACHE" with "EXT-X-ALLOW-CACHE", and value 1/0
with YES/NO, as per spec.

Fix trac ticket #2228.

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
proresdsp: Fix checkheaders

It's been broken since commit ac89875

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
build: Remove superfluous MAKE variable for the build suffix

Use BUILDSUF instead.

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>