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Sutou Kouhei authored and GitHub committed c70c3d51c0c
GH-34995: [C++] Improve available GTest check for SYSTEM case (#34997) ### Rationale for this change The `GTest_SOURCE=AUTO` case worked without this but the `GTest_SOURCE=SYSTEM` case didn't. On conda environment, `SYSTEM` is used. So this is needed for conda environment. ### What changes are included in this PR? Raises an error in the `GTest_SOURCE=SYSTEM` case. ### Are these changes tested? Yes. ### Are there any user-facing changes? Yes. * Closes: #34995 Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>