alpine: New package (v2)

Add Alpine v. 2.10 console mail client as new package to OpenWrt.

Alpine stands for Alternatively Licensed Program for Internet News and
Email and is suitable for both the inexperienced email user as well as
for the most demanding power user.

This is a v2 of my previous patch fixing build issues in certain
flavours of Linux. Thanks to Szymon Zygmunt for reporting.

Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
shflags: Fix getting sources

Freecwmp does not export a git repository for shflags anymore. This fix
makes OpenWrt get the sources directly from the svn repository of the
shflags googlecode project.

Signed-off-by: Diego López Recas <sueltalo@gmail.com>
udpxy: Update to version 1.0.23-9

Update udpxy to version 1.0.23-9.

Switch from http://sourceforge.net/projects/udpxy to http://www.udpxy.com/index-en.html

http://www.udpxy.com/download/1_23/udpxy.1.0.23-9-prod.tar.gz needs to be added to http://downloads.openwrt.org/sources/

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>