Log Message:
when building with SunPro on x86, do not use -fast argument to cc(1)
because:

- its behaviour changes between releases
- it uses build-host specific instructions where possible,
  specifically on >= Solaris 9 update 6 and Sun Studio 9 (sse, sse2)

this breaks using the binary pkg when installed on systems with a
less capable processor. instead, just use -xO5 so the binary pkg will
work everywhere.