Various changes to:

Various changes to:
 * make most non-changing data const
 * silence "gcc -Wall -Werror" complaints on sparc-solaris2.6
 ** delete unused functions and variables
 ** change if(a=b) ... to if((a=b)) or if((a=b)!=0) [yeah, kinda gratuitous]
 ** insert extra braces for 2-D arrays
 * some basic thread safety checks

Not changing afsstring2key.c until I make sure I've got some tests for it.
Currently, prng.c and afsstring2key.c, at least, still aren't thread-safe.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@11959 dc483132-0cff-0310-8789-dd5450dbe970