add D generated files to order-only deps

[rtbo]

fixes #10463

[codecov]

Codecov Report

Merging #10464 (50e5bd4) into master (3e2dba5) will decrease coverage by 18.56%.
The diff coverage is n/a.

❗ Current head 50e5bd4 differs from pull request most recent head e9576a4. Consider uploading reports for the commit e9576a4 to get more accurate results

@@             Coverage Diff             @@
##           master   #10464       +/-   ##
===========================================
- Coverage   68.71%   50.15%   -18.57%     
===========================================
  Files         406      203      -203     
  Lines       87766    43910    -43856     
  Branches    19518     9735     -9783     
===========================================
- Hits        60311    22024    -38287     
+ Misses      22892    19882     -3010     
+ Partials     4563     2004     -2559     

Impacted Files	Coverage Δ
modules/qt5.py	0.00% <0.00%> (-100.00%)	⬇️
modules/modtest.py	0.00% <0.00%> (-100.00%)	⬇️
scripts/run_tool.py	0.00% <0.00%> (-100.00%)	⬇️
scripts/msgfmthelper.py	0.00% <0.00%> (-100.00%)	⬇️
modules/keyval.py	0.00% <0.00%> (-95.24%)	⬇️
scripts/clangtidy.py	0.00% <0.00%> (-93.34%)	⬇️
scripts/vcstagger.py	0.00% <0.00%> (-91.67%)	⬇️
modules/unstable_icestorm.py	0.00% <0.00%> (-91.67%)	⬇️
modules/sourceset.py	0.00% <0.00%> (-90.54%)	⬇️
scripts/depscan.py	0.00% <0.00%> (-83.92%)	⬇️
... and 322 more

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[tristan957]

@dcbaker is this good to merge? Maybe you were waiting for CI to pass and just forgot about it.