Patch from Richard Basch to work around Solaris 8 lacking isblank().

https://github.com/krb5/krb5/commit/4d75811f329fdf893bd7bd5aff84dcfd37cdab89
Commit By: tlyu
Revision: 25716
Changed Files:
U   trunk/src/configure.in
U   trunk/src/plugins/kdb/ldap/libkdb_ldap/kdb_ldap.c