Volk: fix volk.pc.in
volk: Properly sets up package config script if Orc is not found for Volk.
Volk: A bunch of new Orc routines plus a couple of build changes.32fc_magnitude_16s fails test_all right now.
Initial checkin for VOLK - Vector-Optimized Library of Kernels. This is a new SIMD library.
It currently stands by itself under the GNU Radio tree and can be used separately. We will integrate the build process into GNU Raio and start building off of its functionality over time.