util: Use foo_pic.o instead of pic_foo.o

util: Use foo_pic.o instead of pic_foo.o

Be more consistent with the rest of the tree, and name PIC object
files with the convention foo_pic.o.

Change-Id: Ib3b9642534c51ffb10fe3c86f779b4e9df6af4c1
Reviewed-on: http://gerrit.openafs.org/3968
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>