Add Perl support for ucalls / uflow / ustat (#1959)

Sort language entries while at it.
diff --git a/tools/perlcalls.sh b/tools/perlcalls.sh
new file mode 100755
index 0000000..74c6b03
--- /dev/null
+++ b/tools/perlcalls.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+lib=$(dirname $0)/lib
+$lib/ucalls.py -l perl "$@"