Add handling of MSVC `/external:var` option and `EXTERNAL_INCLUDE` env variable.

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Since Sep 10, 2026.

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Description

bug compiler support fixed Language Service

It look like /external:var and EXTERNAL_INCLUDE are not handled. These should influence IntelliSense configurations by potentially adding include paths. (Identifying include path not previously specified, as external, will implicitly specify them as include paths.)

Some behavior clarification is here, in the context of aligning clang-cl behavior with MSVC: https://github.com/llvm/llvm-project/pull/105738

Related: https://github.com/microsoft/vscode-cpptools/issues/14186

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