[build] Use built-in FindBLAS, remove modules for MKL, CBLAS #626
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See title. CMake 3.10 has built-ins for finding BLAS libs that are pretty robust. If using MKL, specify MKL 64-bit + ILP, else specify OpenBLAS (since it'll have a
cblas_sgemmsymbol which we require).Test Plan (required)
Tested build with CMake 3.10 with both MKL and OpenBLAS + CI