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Description of problem:
Fresh install of Phoebe 8.0.94. Wanted to add "gstreamer-devel" and "xmms-devel"
with up2date.

Post-install script in package "gstreamer" fails because package
"gstreamer-tools" is not installed first:

error: %post(gstreamer-0.6.0-4) scriptlet failed, exit status 127

$ rpm -q --qf "%{postin}\n" gstreamer
/sbin/ldconfig
env DISPLAY= /usr/bin/gst-register --gst-mask=0 > /dev/null 2> /dev/null

$ rpm -qf /usr/bin/gst-register 
gstreamer-tools-0.6.0-4

So, gstreamer can only be installed after gstreamer-tools. But up2date did
install in wrong order.

Steps to reproduce:

1. rpm -e gstreamer-devel xmms-devel gstreamer gstreamer-tools
2. up2date gstreamer-devel xmms-devel

-snip-

gstreamer-devel-0.6.0-4.i38 ########################## Done.
xmms-devel-1.2.7-19.p.i386. ########################## Done.
gstreamer-0.6.0-4.i386.rpm: ########################## Done.
gstreamer-tools-0.6.0-4.i38 ########################## Done.
Preparing              ###########################################
[100%]

Installing...
   1:gstreamer-devel
########################################### [100%]
   2:xmms-devel
########################################### [100%]
   3:gstreamer
########################################### [100%]
error: %post(gstreamer-0.6.0-4) scriptlet failed, exit status 127
   4:gstreamer-tools
########################################### [100%]
The following packages were added to your selection to satisfy
dependencies:

Name                                    Version        Release
--------------------------------------------------------------
gstreamer                               0.6.0          4
gstreamer-tools                         0.6.0          4