Use non-POSIX, but POSIX-compatible, expressions for tr to fix
make_zipconf.sh on some Solaris version. Reported and patched by
Vassili Courzakis <vcoxvco@googlemail.com>.

--HG--
branch : HEAD

THANKS

diff --git a/THANKS b/THANKS
index a0b2316..d9c0635 100644
--- a/THANKS
+++ b/THANKS
@@ -19,3 +19,4 @@
 Simon Talbot <simont@nse.co.uk>
 Stephen Bryant <steve@bawue.de>
 Tarmo Pikaro <tapika@yahoo.com>
+Vassili Courzakis <vcoxvco@googlemail.com>