group some entries, no functional change
pullup librumpuser to latest in a wholesale fashion
Pull in RUMP_KERNEL_IS_LIBC syscall symbol aliasing improvements.

For example, select is now available as "select" in addition to
being available under the compat name "__select50".
Source for buildrump.sh git rev ab598b808a0f0117d610e556c2a6b1913d6a849c