Add depfiles for ninja build #52
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This adds the
depfileattribute to the mwcc ninja build command so that mwcc will generate a list of headers for each source file, and ninja will use that to detect changes. This fixes the issue where objdiff's auto-rebuild-on-change wouldn't do anything when a header file was modified.transform_dep.pywas copied with no changes from dtk-template: https://github.com/encounter/dtk-template/blob/54bf50ee31ef7242c74f398529279c62394c68c6/tools/transform_dep.py