beagle: r1094 - Streamline formula.

Small improvements to the formula. First, the source code for BEAGLE has been
fixed to no longer require patching in AC_CONFIG_HEADERS. Second, the explicit
path for CUDA was removed. The BEAGLE makefile already does this automatically.
This is still HEAD only. BEAGLE is not currently providing a stable source code
release.
Merge remote-tracking branch 'origin/beagle-r1094'

* origin/beagle-r1094:
  beagle: r1094 - Streamline formula.