volk: Fixing makefiles for dist. Distcheck still failing on other issues now.
volk: Adding gitignore files.
volk: Updating build system so that volk configures and builds from gnuradio top level dir.
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.
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