remove config.guess

this is automatically generated by autoreconf -i
ignore "compile" script

not sure what this even is, but it's generated by autoreconf -i
ignore soundmodem.conf
autoconf seems to want configure.in to be called configure.ac
Cleanup configuration files

We don't want to have intermediate build files checked in to the
repository. Clean up some of those, and run autoreconf -i instead, to
install those in CI

Signed-off-by: Max Sikstrom <msikstrom@op5.com>