[Portability] The stringop-overread warning is not available on clang

[VeithMetro]

It came up while building one of the plugins on macOS (Apple Clang) which uses this macro to disable a warning:

[1/105] Building CXX object DHCPServer/CMakeFiles/ThunderDHCPServer.dir/DHCPServer.cpp.o
FAILED: DHCPServer/CMakeFiles/ThunderDHCPServer.dir/DHCPServer.cpp.o 
/Applications/Xcode_15.4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -DPROCESSCONTAINERS_ENABLED=1 -DTHUNDER_PLATFORM_PC_UNIX=1 -DThunderDHCPServer_EXPORTS -DWARNING_REPORTING_ENABLED -D_TRACE_LEVEL=0 -D__CORE_MESSAGING__ -D__CORE_NO_WCHAR_SUPPORT__ -D__CORE_WARNING_REPORTING__ -isystem /Users/runner/work/ThunderNanoServices/ThunderNanoServices/MinSizeRel/install/usr/include/Thunder -isystem /Users/runner/work/ThunderNanoServices/ThunderNanoServices/MinSizeRel/install/usr/include -isystem /Users/runner/work/ThunderNanoServices/ThunderNanoServices/MinSizeRel/install/usr/include/Thunder/processcontainers -Wall -Wextra -Wpedantic -Werror -Os -DNDEBUG -std=gnu++11 -arch arm64 -isysroot /Applications/Xcode_15.4.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.5.sdk -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -MD -MT DHCPServer/CMakeFiles/ThunderDHCPServer.dir/DHCPServer.cpp.o -MF DHCPServer/CMakeFiles/ThunderDHCPServer.dir/DHCPServer.cpp.o.d -o DHCPServer/CMakeFiles/ThunderDHCPServer.dir/DHCPServer.cpp.o -c /Users/runner/work/ThunderNanoServices/ThunderNanoServices/ThunderNanoServices/DHCPServer/DHCPServer.cpp
In file included from /Users/runner/work/ThunderNanoServices/ThunderNanoServices/ThunderNanoServices/DHCPServer/DHCPServer.cpp:20:
/Users/runner/work/ThunderNanoServices/ThunderNanoServices/ThunderNanoServices/DHCPServer/DHCPServer.h:88:17: error: unknown warning group '-Wstringop-overread', ignored [-Werror,-Wunknown-warning-option]
                        PUSH_WARNING(DISABLE_WARNING_STRING_OPERATION_OVERREAD);
                                     ^