Fix relative CMAKE_USER_MAKE_RULES_OVERRIDE (#11725)
In commit 295b5b60 (Honor CMAKE_USER_MAKE_RULES_OVERRIDE in try_compile, 2010-06-29) we started passing the value of this variable when building a try_compile project. If the variable contains a relative path it must be treated with respect to the file where it is first used. Ensure that the value is converted to a full path so that it is correctly referenced in the try_compile projects.
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