Update CPU optimization flags for Sun Studio to the previous decade.
Update CPU optimization flags for Sun Studio to the previous decade.

Also use -xO5 instead of -xO2; everything seems to work under -xO5 on
x86-32 and x86-64 with my version of Sun Studio. Curiously, several things
are miscompiled with -xO2! Definitely doesn't give me positive feelings
about this optimizer.

randombit/botan,webmaster128/botan,Rohde-Schwarz-Cybersecurity/botan,Rohde-Schwarz-Cybersecurity/botan,randombit/botan,Rohde-Schwarz-Cybersecurity/botan,webmaster128/botan,randombit/botan,randombit/botan,Rohde-Schwarz-Cybersecurity/botan,webmaster128/botan,webmaster128/botan,randombit/botan,Rohde-Schwarz-Cybersecurity/botan,Rohde-Schwarz-Cybersecurity/botan,webmaster128/botan