CcToolchainInfo.built_in_include_directories are not added to include directories

[LeFrosch]

Description of the bug:

When using a custom toolchain the include directories of the toolchain are ignored. Therefore, files specific to this toolchain cannot be resolved.

Which category does this issue belong to?

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What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

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Which Intellij IDE are you using? Please provide the specific version.

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What programming languages and tools are you using? Please provide specific versions.

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What Bazel plugin version are you using?

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Have you found anything relevant by searching the web?

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Any other information, logs, or outputs that you want to share?

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[LeFrosch]

After further investigation I do not think this is necessary.