Unnecessarily enforced -Werror in perfdhcp Makefiles

Noticed a compilation error on FreeBSD which was caused by these fringe -Werrors. They are the only ones out of all the Makefile.ams.

src/bin/perfdhcp/Makefile.am
6:AM_CPPFLAGS += -Werror

src/bin/perfdhcp/tests/Makefile.am
7:AM_CPPFLAGS += -Werror

I suggest to remove them. The proper way to enable -Werror is --with-werror which enables it everywhere.

Edited Jan 06, 2021 by Andrei Pavel

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