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be571f32c3
Adds `addFileContentArg` and `addPrefixedFileContentArg` to pass the content of a file with a lazy path as an argument to a `std.Build.Step.Run`. This enables replicating shell `$()` / cmake `execute_process` with `OUTPUT_VARIABLE` as an input to another `execute_process` in conjuction with `captureStdOut`/`captureStdErr`. To also be able to replicate `$()` automatically trimming trailing newlines and cmake `OUTPUT_STRIP_TRAILING_WHITESPACE`, this patch adds an `options` arg to those functions which allows specifying the desired handling of surrounding whitespace. The `options` arg also allows to specify a custom `basename` for the output. e.g. to add a file extension (concrete use case: Zig `@import()` requires files to have a `.zig`/`.zon` extension to recognize them as valid source files).