Bug 260841

[Win] rewrite-compile-commands reports a lot of warning messages "Failed to find ..."

After 266947@main (bug#260218), build-webkit reports the following warnings.

[38/6520] cmd.exe /C "cd /D S:\wwbb\work\build\WebKitBuild\Debug && C:\Python311\python.exe S:/wwbb/work/build/Tools/Scripts/rewrite-compile-commands S:/wwbb/work/build/WebKitBuild/Debug/compile_commands.json S:/wwbb/work/build/WebKitBuild/Debug/DeveloperTools/compile_commands.json S:/wwbb/work/build S:/wwbb/work/build/WebKitBuild/Debug"
Failed to find BytecodeDumperGenerated.cpp
Failed to find inspector/InspectorBackendDispatchers.cpp
Failed to find inspector/InspectorFrontendDispatchers.cpp
Failed to find inspector/InspectorProtocolObjects.cpp
Failed to find yarr/YarrCanonicalizeUnicode.cpp
Failed to find CSSPropertyParsing.cpp
Failed to find CSSValueKeywords.cpp
Failed to find ColorData.cpp
Failed to find EventFactory.cpp
Failed to find EventTargetFactory.cpp
Failed to find HTMLElementFactory.cpp
Failed to find HTMLEntityTable.cpp
Failed to find JSANGLEInstancedArrays.cpp
Failed to find JSAbortAlgorithm.cpp
(...)