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GNUInstallDirs: avoid unwanted variable dereference

Ben Boeckel requested to merge ben.boeckel/cmake:GNUInstallDirs-variable-named-0 into master

In some situations, it seems that the variable 0 is defined. In the case found, it was set to 1. This makes the detection of the missing third argument bogus and unnecessarily triggers a warning.

This oversight was introduced in 229b5ee9 (GNUInstallDirs: Add dir argument to GNUInstallDirs_get_absolute_install_dir, 2020-10-31) prior to CMake 3.20's release cycle.

Eligible for 3.20.6 as well (as 3.20 contained !5450 (merged)).

Cc: @rleigh

Backport: release

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