Dan Johnston 97c124e30f Ninja: Add a separate job pool for PCH creation
Add a `JOB_POOL_PRECOMPILE_HEADER` target property to specify the pool
name, and its associated `CMAKE_JOB_POOL_PRECOMPILE_HEADER` variable.

Fixes: #20217
2020-01-16 10:32:25 -05:00
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