Compiler fixes for gcc 10

This patch fixes a few compile warnings/errors that now occur when using gcc
10+.

Also, the Makefile.rules check to turn off partial inlining in gcc versions
greater or equal to 8.2.1 had a bug where it only it only checked against
versions with at least 3 numbers (ex: 8.2.1 vs 10). This patch now ensures
any version above the specified version is correctly compared.

Change-Id: I54718496eb0c3ce5bd6d427cd279a29e8d2825f9

utils/db1-ast/hash/ndbm.c

@@ -79,8 +79,7 @@ dbm_open(file, flags, mode)
 	info.cachesize = 0;
 	info.hash = NULL;
 	info.lorder = 0;
-	(void)strcpy(path, file); /* SAFE */
-	(void)strncat(path, DBM_SUFFIX, len - strlen(path) - 1);
+	snprintf(path, len, "%s%s", file, DBM_SUFFIX);
 	db = (DBM *)__hash_open(path, flags, mode, &info, 0);
 #ifndef	__GNUC__
 	free(path);