* Changed dtv_viterbi_decoder to use __GR_ATTR_ALIGNED macro for cross-compiler compatibility * Replace usleep() with boost equivalent for cross-compiler compatibility * Includes windows-specific headers for portaudio * Added macro to handle use of VLAs on non-C99 compilers (MSVC) using alloca to declare variable length arrays * Remove setting SO_LINGER option for the UDP source. SO_LINGER is not an applicable option for a UDP socket. Windows will throw an exception if set. Linux allows it to be set but does not use it. * VS 2013+ supports round()