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0cd4babe03
This reapplies 272d1b44efdedb68c194970a610f0ca1b7b769c5 (from #85756), which was reverted in 407937036fa7640f61f225474b1ea6623a40dbdd. In the previous attempt, empty CMAKE_INSTALL_PREFIX was handled by quoting them, in d209d1340b99d4fbd325dffb5e13b757ab8264ea. That made the calls to cmake_path(ABSOLUTE_PATH) succeed, but the output paths of that weren't actually absolute, which was required by file(RELATIVE_PATH). Avoid this issue by constructing a non-empty base directory variable to use for calculating the relative path. (cherry picked from commit 50801f1095d33e712c3a51fdeef82569bd09007f)