configure --enable-ethread-pre-pentium4-compatibility does not properly enable ETHR_PRE_PENTIUM4_COMPAT on R14B

[viq]

I tried this both on linux and OpenBSD, and running
configure --enable-ethread-pre-pentium4-compatibility
does give us
./erts/configure:#define ETHR_PRE_PENTIUM4_COMPAT 1
but it is not defined so in the build directory, thus producing binaries
that dump core on processors older than Pentium 4 with example command erl +A1
Both when trying to compile R14B from sources, flag (and issue) as per
http://www.erlang.org/download/otp_src_R14B.readme referencing OTP-8544

-- 
viq