XrdXrootdProtocol missing copy ctor (GCC 9)

[Axel-Naumann]

Fedora 30's GCC complains:

/build/ws/BUILDTYPE/Release/LABEL/ROOT-fedora30/build/XROOTD-prefix/src/XROOTD/src/XrdXrootd/XrdXrootdProtocol.cc: In member function ‘XrdXrootdProtocol XrdXrootdProtocol::operator=(const XrdXrootdProtocol&)’:
/build/ws/BUILDTYPE/Release/LABEL/ROOT-fedora30/build/XROOTD-prefix/src/XROOTD/src/XrdXrootd/XrdXrootdProtocol.cc:234:12: error: implicitly-declared ‘XrdXrootdProtocol::XrdXrootdProtocol(XrdXrootdProtocol&)’ is deprecated [-Werror=deprecated-copy]
  234 |    return *this;
      |            ^~~~
/build/ws/BUILDTYPE/Release/LABEL/ROOT-fedora30/build/XROOTD-prefix/src/XROOTD/src/XrdXrootd/XrdXrootdProtocol.cc:215:19: note: because ‘XrdXrootdProtocol’ has user-provided ‘XrdXrootdProtocol XrdXrootdProtocol::operator=(const XrdXrootdProtocol&)’
  215 | XrdXrootdProtocol XrdXrootdProtocol::operator =(const XrdXrootdProtocol &rhs)
      |                   ^~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
gmake[5]: *** [src/CMakeFiles/XrdServer.dir/build.make:245: src/CMakeFiles/XrdServer.dir/XrdXrootd/XrdXrootdProtocol.cc.o] Error 1
gmake[4]: *** [CMakeFiles/Makefile2:554: src/CMakeFiles/XrdServer.dir/all] Error 2

(And yes I know we shouldn't be building that, but convincing CMake of that is all but trivial...)

[simonmichal]

@Axel-Naumann : from what I see this has been fixed about 4 months ago:
https://github.com/xrootd/xrootd/blame/master/src/XrdXrootd/XrdXrootdProtocol.cc#L216

in commit 7c5fc93

[Axel-Naumann]

Indeed! Sorry, I missed that: I did have a look but failed to find it :-(