Use GNU make's foreach iterator and remove nonexistent files. Gmake is
already a requirement of the build system.
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
This regresses Cyclone V and Cyclone 10 substantially, but these
numbers were artificial, targeting a BRAM that they did not contain.
Amusingly, synth_intel still does better when synthesizing PicoSoC
than Quartus when neither are inferring block RAM.