cmUVSignalHackRAII: Drop outdated and unused libuv SA_RESTART workaround

It is only needed for libuv < 1.19, but since commit c050d6a01e
(string(TIMESTAMP): add %f specifier for microseconds, 2022-01-27,
v3.23.0-rc1~59^2) we require libuv >= 1.28.
4 files changed