Enable (assume) UTF-8 in saturnin_urimagic

src/ffoo/saturnin_urimagic.sh

     # Hack expressions like bug = 123 out of the text
     #
     sed -e 's/(\d)\</\n/;' \
-      | perl -ne '
+      | perl -CS -ne '
             next unless m/\b([a-zA-Z]\w*\s*=\s*\w+)\b/;
             print "$1\n";
         ' \
     # Hack doer-like id's (ID#123) out of the text
     #
     tr ' ' '\n' \
-      | perl -ne '
+      | perl -CS -ne '
             next unless m/\b([a-zA-Z]\w*#\w+)\b/;
             print "$1\n";
         ' \
     # Hack URIs out of the text.
     #
     tr ' ' '\n' \
-      | perl -ne '
-            next unless m|(\bhttps?://[[:alnum:]_:/.?#&+,%@=;~-]+)\b|;
+      | perl -CS -ne '
+            next unless m|(\bhttps?://[[:alnum:]_:/.?#&+,%@=;~-]+)\b|u;
             print "$1\n";
         '
 }