kerberos5/lib/libkdc build warning fixes

[aprieger_llnw.com]

Summary

kerberos5/lib/libkdc build time warning fixes

[aprieger_llnw.com]

Changelog:
Pre-fix warnings are at: https://github.llnw.net/gist/aprieger/fc51f108152d4ef69f5c

1. crypto/heimdal/kdc/digest.c
   • Warnings:
     • warning: absolute value function 'abs' given an argument of type 'long' but has parameter of type 'int' which may cause truncation of value [-Wabsolute-value]
   • Fixes:
     • changed the abs() function to labs() to handle the long argument on line 608
2. crypto/heimdal/kdc/kerberos5.c
   • Warnings:
     • warning: absolute value function 'abs' given an argument of type 'long' but has parameter of type 'int' which may cause truncation of value [-Wabsolute-value]
   • Fixes:
     • changed the abs() function to labs() to handle the long argument on line 1299 and 1310
3. crypto/heimdal/kdc/pkinit.c
   • Warnings:
     • warning: absolute value function 'abs' given an argument of type 'long' but has parameter of type 'int' which may cause truncation of value [-Wabsolute-value]
   • Fixes:
     • changed the abs() function to labs() to handle the long argument on line 104 and 126