[configure] enable TLS support in ffmpeg via gnutls
[depends] add gnutls
try to fix gmp compilation on android
only set gmp ABI on 32bit linux
[WIN32] added gnutls 3.2.3 to our mingw environment and the runtime dlls to system/players/dvdplayer
[WIN32] added: build ffmpeg with gnutls support. Force extracting during unzipping.
[gnutls] add missing zlib dependency
Merge branch 'ffmpeg-gnutls' of https://github.com/wsnipex/xbmc into miappa_xbmc