Fix various build problems with the test suite

Fix various build problems with the test suite

The cmd/command-t test requires libroken and was misspelled in the
TESTS file.  Multiple tests require LD_LIBRARY_PATH to be set to find
libafsroken if it hasn't been installed, so set it when running
runtests via make check.  (Note that this means runtests -o will not
work properly unless the user also sets LD_LIBRARY_PATH.)

Change-Id: Ib64f0505b3b75db33adb6c7b6452dcaac0b05dbc
Reviewed-on: http://gerrit.openafs.org/4594
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>