sysutils/slurm-wlm: Fix WITHOUT_KERBEROS build and configure issue
- Fix build when WITHOUT_KERBEROS is used by patching files to remove '#include <roken.h>'. [1]
- Fix configure when PREFIX is set to something other than /usr/local. The check for man2html is hard-coded to search /usr/bin and /usr/local/bin. [2]
PR: 225989
Submitted by: tijl [1] jwb [2]