(1)renamed
   adler32.c -> zadler32.c
   zcrc32c -> zcrc32.c

(2)added _LP64 to make uLong a 32-bit int on 64-bit platform
   zconf.h:
   uLong -> 32-bit int

(3)updated crc32.c/crc32()
   unsigned long      -> uLong