Libc update to simplify merge.

Bumping libc files for unsupported architectures, to simplify merging.
A bunch of small fixes:
 * in libutil update
 * the macro in endian.h
 * some undefined types due to clear separation from host.
 * Fix a warning for cdbr.c

Some modification which were required for the new build system:
 * inclusion path for const.h in sconst, still hacky
 * Removed default malloc.c which conflicts on some occasions.

lib/libc/cdb/cdbr.c

@@ -128,7 +128,7 @@ cdbr_open(const char *path, int flags)
 		return NULL;
 	}
 
-	if (read(fd, cdbr->mmap_base, cdbr->mmap_size) != cdbr->mmap_size)
+	if ((size_t)read(fd, cdbr->mmap_base, cdbr->mmap_size) != cdbr->mmap_size)
 	{
 		free(cdbr->mmap_base);
 		free(cdbr);