CMakeLists.txt: Default USE_PCH to ON
This makes compilation on developer machines faster out-of-the-box. We already set it to ON for all minus one CI jobs in 912d1886 (.travis.yml: Default USE_PCH to ON, 2019-10-25).
See also #567 (closed).
This makes compilation on developer machines faster out-of-the-box. We already set it to ON for all minus one CI jobs in 912d1886 (.travis.yml: Default USE_PCH to ON, 2019-10-25).
See also #567 (closed).