Revert "Reland [clang] Canonicalize system headers in dependency file… #7773
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… when -canonical-prefixes" (llvm#71697)
This reverts commit 578a471.
This causes multiple issues. Compile time slowdown due to more path canonicalization, and weird behavior on Windows.
Will reland under a separate flag
-f[no-]canonical-system-headers
to match gcc in the future and further limit when it's passed by default.Fixes llvm#70011.
(cherry picked from commit 955dd88)
rdar://118178759