improve documentation of macos x compilation, especially regarding generating bundle compatible with older macos version.

make dist was limited to 99 character long filenames.

generate rootca.pem at compilation time using mk-ca-bundle.pl from curl which gather trusted certificates from modizilla

- update ms2 to get opus filter with locks on ptime

- to avoid ptime automatic growing too high when packets are losts
- setting overridden up to 100 by initial set ptime

and fix uninit to free the audio converter.