[krbdev.mit.edu #8254] [PATCH] configure: use appropriate default for krb5_cv_sys_rcdir when cross-compiling

[Greg Hudson via RT]

/var/tmp also appears to be mandated by the FHS, and is our preference 
for replay caches for a reason (we want replay caches to survive a 
reboot).  So it seems like a better cross-compilation default than 
/tmp, although it wouldn't help your use case.  Do you know why 
/var/tmp is not present on OpenWRT?