Improve incremental build: Make outputs modified outside of the build system considered dirty#1951

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Dragnalith wants to merge 3 commits intoninja-build:masterfrom Dragnalith:consider_modified_output_dirty

+131-9

Commits on Mar 30, 2021

Make outputs modified outside of the build system considered dirty
Dragnalith
committed

Commits on Apr 15, 2021

Add an '-m' option to enable 'modified output is considered dirty'
Dragnalith
committed

Commits on Apr 19, 2021

Fix restat situation when not all outputs are restat
Dragnalith
committed