Add -fno-cxx-modules to clang's known -Xclang flags#2717
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Downstream Bazel's C++ toolchain passes `-Xclang -fno-cxx-modules` in its compiler sanity checks. Since -fno-cxx-modules wasn't in sccache's known flag list, the xclang argument parser in gcc.rs treated it as an UnknownFlag and bailed with CannotCache.
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Downstream Bazel's C++ toolchain passes
-Xclang -fno-cxx-modulesin its compiler sanity checks. Since -fno-cxx-modules wasn't in sccache's known flag list, the xclang argument parser in gcc.rs treated it as an UnknownFlag and bailed with CannotCache.