adds support for GCC 9

Kaldi shows this message when compiling under gcc 4.8.2:

*** WARNING: your version of gcc seems to be 4.8.2. ***
*** This version of gcc has a bug in nth_element ***
*** in its implementation of the standard library ***
*** This will cause Kaldi to crash (make test   ***
*** should fail). Please either upgrade or downgrade gcc. ***

So, this commit adds a newer version of gcc to get around this.
adds symlinks to new gcc binaries
configures src for kaldi
adds build