[Cin] minor configure.ac changes.

[Andrea paz]

I made a build with the 2 patches of "configure.ac" + the other 4
patches ("cleanups"). I have no errors. I have not tried the proxy. I
enclose cin5.log and config.log if it is of interest.

NOTE: If I want to try to enable hardware acceleration just use the
option: ..with-hwaccel=auto?
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