Config script option to disable AVX.

Fix compiler (Gcc 4.9) warnings.

bsdiff/bscommon.h

@@ -62,9 +62,12 @@ static bsize_t
 BUFREAD(bufio_t *bio, uchar_t *buf, bsize_t len)
 {
 	bsize_t actual;
+	unsigned int tot;
 
 	actual = len;
-	if (bio->pos + len > bio->buflen) {
+	tot = len;
+	tot += bio->pos;
+	if (tot > bio->buflen) {
 		actual = bio->buflen - bio->pos;
 	}
 	if (actual == 0) return (0);

config

@@ -200,6 +200,9 @@ do
 		sse_detect=0
 		avx_detect=0
 	;;
+	--no-avx-detect)
+		avx_detect=0
+	;;
 	--no-1.3-archive-compat)
 		crypto_compat_objs=""
 		crypto_compat_flags=""

rabin/rabin_dedup.c

@@ -181,7 +181,7 @@ create_dedupe_context(uint64_t chunksize, uint64_t real_chunksize, int rab_blk_s
 	 */
 	pthread_mutex_lock(&init_lock);
 	if (!inited) {
-		int term, pow, j;
+		unsigned int term, pow, j;
 		uint64_t val, poly_pow;
 
 		poly_pow = 1;