CMake Nightly Date Stamp
Ninja: Query custom commands once per target, not once per file.

Computing the source files is now more expensive, so the Ninja
generator became very slow with a large number of files.
Merge topic 'optimize-source-file-processing' into next

6c202d15 Ninja: Query custom commands once per target, not once per file.
ce0aae70 CMake Nightly Date Stamp