Makefiles where this was fixed by commenting away code, change it to
check for an empty EXHEADER instead, so we have less hassle in a
future where EXHEADER changes.
PR: 900
OpenSSL-fips-0_9_7-stable.
Since the 0.9.7-stable branch is supposed to be in freeze and should
only contain bug corrections, this change removes the FIPS changes
from that branch.