In file included from Proxy.h:39:0,
                 from ServerProxy.h:32,
                 from ServerProxy.cpp:36:
Channel.h: In member function 'int Channel::handleEncodeIdentity(EncodeBuffer&, ChannelCache*, MessageStore*, const unsigned char*, unsigned int, int)':
Channel.h:369:3: warning: declaration of 'bigEndian' shadows a member of 'this' [-Wshadow]
   {
   ^
Channel.h: In member function 'int Channel::handleDecodeIdentity(DecodeBuffer&, ChannelCache*, MessageStore*, unsigned char*&, unsigned int&, int, WriteBuffer*)':
Channel.h:378:3: warning: declaration of 'bigEndian' shadows a member of 'this' [-Wshadow]
   {
   ^

RHEL7's g++ 4.8.5 reports this while Debian's g++ 10.2.0-15 does
not. This is described in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57709 and fixed in gcc
5.0.

Rename the variables anyway to be on the safe side.

Fixes ArcticaProject/nx-libs#956