tests: Handle disabled algorithms.

* tests/openpgp/mds.test: Skip disabled algorithms.
* tests/openpgp/signencrypt-dsa.test: Ditto.
* tests/openpgp/sigs-dsa.test: Ditto.

tests/openpgp/signencrypt-dsa.test

@@ -18,7 +18,14 @@ for i in $plain_files $data_files ; do
     cmp $i y || error "$i: mismatch"
 done
 
-for da in ripemd160 sha1; do
+algos="sha1"
+if have_hash_algo "RIPEMD160"; then
+  algos="ripemd160 $algos"
+else
+  echo "Hash algorithm RIPEMD160 is not installed (not an error)"
+fi
+
+for da in $algos; do
     for i in $plain_files; do
 	$GPG --always-trust -se -o x --yes --digest-algo $da \
 		    -u "$dsa_usrname1" -r "$dsa_usrname2" $i