* des.h: Change to make KRB4_32 an int if it's at least 32 bits

	* des.h: Change to make KRB4_32 an int if it's at least 32 bits
	wide, else a long.  This is a change from previously where it was
	a long except on the alpha.  We may want to rethink this if there
	are binary compat issues that result.  Also, define DES_INT32 as
	KRB4_INT32.

	* krb.h: Add new macros KRB4_PUT32, KRB4_PUT16 which
	unconditionally encode integers by bytes as big-endian.  Add new
	macros KRB4_GET32BE, KRB4_GET32LE, KRB4_GET32, KRB4_GET16BE,
	KRB4_GET16LE, KRB4_GET16 to retrieve integers by bytes.  Add
	prototype for krb_strnlen.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@12858 dc483132-0cff-0310-8789-dd5450dbe970