[IOS] Fix popen crash during xbmc starting up, it not work ios and may crash.
Merge pull request #2455 from ulion/fix_ios_startup_crash_on_popen

[IOS] Fix popen crash during xbmc starting up, it may not work on ios
CoreAE: fix invalid logging about mixing matrix
[osx] - fix compile after reshuffle 16f276b
Remove pointless calls.
depends: avoid being osx version dependent in ignores
CoreAE: mixing unit must have same output count as mixing map
[ios] - fix compile after reshuffle 16f276b
[ios] - kill warnings
CoreAE: fix null dereference if no mixer map was created