* Makefile.in: made to work under Windows

* Makefile.in: made to work under Windows
   - added windows only make preamble
   - moved the all target after the objects it depends on
   - used $(OBJEXT) and $(EXEEXT) where needed
   - split crctest into unix rules and windows rules
   - changed file separatars into macros where needed
* crctest.c: changed int to long to work on 16 bit machines
* crc.c: added Windows calling convention to the function
   and casted the assignment of the function.
[There's a minor problem -- the cast should be fixed another way --
 but I'll check it in this way and then Keith will fix it.]

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@4949 dc483132-0cff-0310-8789-dd5450dbe970