4.18 Linux build errors with: clang10, bp nativization

Development Platform & Builds
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10

According to Windows, my drive is not “C”, it is “c”, so path is actually correct.
RCL, it does not look like “-Wnonportable-include-path” is in LinuxToolChain.cs: \Engine\Source\Programs\UnrealBuildTool\Platform\Linux\LinuxToolChain.cs