Migrate from egg-* to libdazzle.
Splits the original patch in !35 (closed) and remove the configure.ac bits and m4/gb_enable_rdtscp.m4 file that were added for EggCounter.
Splits the original patch in !35 (closed) and remove the configure.ac bits and m4/gb_enable_rdtscp.m4 file that were added for EggCounter.