make compressed help code NOMMU- and NOFORK-friendly -

no forking anymore, bunzip2 unpack routine now does all it in memory.

coreutils/cksum.c

@@ -11,8 +11,7 @@
 int cksum_main(int argc, char **argv);
 int cksum_main(int argc, char **argv)
 {
-
-	uint32_t *crc32_table = crc32_filltable(1);
+	uint32_t *crc32_table = crc32_filltable(NULL, 1);
 
 	FILE *fp;
 	uint32_t crc;