Build/GCC: Suppress -Wclobbered warnings on older compilers

There were a high number of false positives with old compilers. Suppress these warnings on them.

cmake/compiler/gcc/settings.cmake

@@ -5,6 +5,7 @@ target_compile_options(zm-warning-interface
     -Wextra
     -Wformat-security
     -Wno-cast-function-type
+    $<$<VERSION_LESS_EQUAL:$<CXX_COMPILER_VERSION>,10>:-Wno-clobbered>
     -Wno-unused-parameter
     -Woverloaded-virtual)