Suppress some cases in `Source/cmGeneratorExpressionNode.cxx` and
`Source/cmUVHandlePtr.h` where a few older compilers require a
user-defined default constructor (with `{}`).
If a partial message is flushed into the input pipe for CMake Server,
the parser will try and parse it as a full message because of some bad
loop checks. This was introduced accidentally in commit
v3.10.0-rc1~365^2~2 (server: Refactor to make the event loop owned by
server object, 2017-03-24).
