Added a comment to the makefile about using a version of ATLAS that has been built from source.
Added a comment to the makefile about using a version of ATLAS that has been built from source.


Former-commit-id: 155d2fc5b4dac697d5c5b02e253a7accdb5384f0
Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide