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autogen: fix race in depfile parsing

Kyle Edwards requested to merge kyle.edwards/cmake:depfile-reader-thread-safety into master

cmReadGccDepfile() calls cmSystemTools::CollapseFullPath(), which is not thread safe due to internal caching. Serialize calls to cmReadGccDepfile() in autogen to avoid thread safety issues.

Fixes: #22014 (closed)
Backport: release

Edited by Brad King

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