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Revert back to a macro so that list(APPEND CMAKE_REQUIRED_DEFINITIONS) will affect the calling scope. I had forgotten that while CMake functions inherit the variables from the parent scope, the changes to them are local unless using set(... PARENT_SCOPE). This also means that the commit message in 5bb77d0920dc is wrong. The commit itself is still fine, making it clearer that -DHAVE_SYS_PARAM_H is only needed for specific check_c_source_compiles() calls. Fixes: c1ea7bd0b60eed6ebcdf9a713ca69034f6f07179