* error_message.c (error_message): Mask error code with

	* error_message.c (error_message): Mask error code with
		ERRCODE_MASK to handle case where 32bit ints are zero
		filled in the gssapi layer.

	* error_table.h: Define ERRCODE_MAX, the maximum allowed error
		code (32bits).

I am taking the draconian outlook that the com_err library was always
intending to define the error as a 32 bit value. I taken this approach
instead of making the errcode_t machine specific as the com_er
generated header files would then need be machine specific as
well. (error codes are declared as say -4353L explicitly).

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@10122 dc483132-0cff-0310-8789-dd5450dbe970