FIX: enable ripemd160 checksum

resolves: Oldes/Rebol-issues#2516

src/core/n-strings.c

@@ -203,7 +203,7 @@ static struct digest {
 		data = VAL_BIN_DATA(arg);
 	}
 
-	if (sym > SYM_CRC32 && sym <= SYM_SHA512) {
+	if (sym > SYM_CRC32 && sym <= SYM_RIPEMD160) {
 		// O: could be optimized using index computed from `sym`
 		// find matching digest:
 		for (i = 0; i < sizeof(digests) / sizeof(digests[0]); i++) {

src/tests/units/checksum-test.r3

@@ -172,7 +172,27 @@ D2079D59D6984814DAC71CDEB38097DB52F77810391FD7B6F92FFBD64EA93DF8
 		--assert port? update port
 		--assert sum1 = port/data
 		close port
-
+if find system/catalog/checksums 'ripemd160 [
+	;@@ https://github.com/Oldes/Rebol-issues/issues/2516
+	--test-- "checksum-port-ripemd160"
+		port: open checksum:ripemd160
+		sum1: checksum bin 'ripemd160
+		sum2: checksum join bin bin 'ripemd160
+		--assert #{595FEC4966B173C6CD00ECCAF1A007F3C6C5B938} = sum1
+		--assert port? port
+		--assert open? port
+		--assert 'ripemd160 = port/spec/method
+		--assert port? write port bin
+		--assert sum1 = read port
+		--assert port? write port bin
+		--assert sum2 = read port
+		--assert sum2 = read port
+		--assert not open? close port
+		--assert port? write open port bin
+		--assert port? update port
+		--assert sum1 = port/data
+		close port
+]
 	--test-- "checksum-write-refinements"
 		port: open checksum://
 		write/part port bin 1