Go back to non-verbose Makefiles.

(The difference in question turned out to be that optimization wasn't
turned on for autotools builds but was turned on for CMake builds.
Comparing the compiler options also found some other differences that
should be cleaned up.)

Change-Id: I2edb28dedc47fe10b3f68f25d3e302430b27bf46
Reviewed-on: https://code.wireshark.org/review/3386
Reviewed-by: Guy Harris <guy@alum.mit.edu>