Fix a memory error
Statically link in some of the more performance-critical dependencies
, and build our own Portaudio to statically link that is configured
with --with-jack=no and --with-oss=no.

This gives a measurable increase in performance, and also alleviates
stuttering at startup (apparently due to the library not yet being
loaded in memory yet).
Update .gitignore
Fixed Makefile variable names overlapping with standard environment
variables...