ifdef cleanup
Get rid of a few unnecessary ifdefs that aren't used on the platforms we support today.
- unifdef
__UNIXOS2__ - unifdef
QNX4 - Use autoconf instead of platform
ifdefs to check forlrand48() - unifdef
SYSV
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Get rid of a few unnecessary ifdefs that aren't used on the platforms we support today.
__UNIXOS2__
QNX4
ifdefs to check for lrand48()
SYSV