Patch from Secure Endpoints/Asanka Herath for windows support

lib/krb5/n-fold.c

@@ -96,7 +96,7 @@ add1(unsigned char *a, unsigned char *b, size_t len)
     }
 }
 
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 _krb5_n_fold(const void *str, size_t len, void *key, size_t size)
 {
     /* if len < size we need at most N * len bytes, ie < 2 * size;