Bug 242884 Proxy config should require hostIP:port and/or error

patch by ajschult@verizon.net r=timeless

xpinstall/wizard/unix/src2/installer.ini

@@ -87,4 +87,4 @@ UNKNOWN=Unknown
 -628=Installation has failed due to multiple CRC failures.
 -629=Usage message shown
 -630=Destination directory must be empty or contain a previous installation.
-
+-631=Invalid proxy settings