cmake: Respect --prefix for headers during cmake --install #1060
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Removing CMAKE_INSTALL_PREFIX allows for
cmake --install <build-dir> --prefix=<installation-prefix>to install headers at<installation-prefix>/includeat install time.When CMAKE_INSTALL_PREFIX is present in
INSTALL(), it is hard-coded during configuration (e.g.,cmake -S .), which disallows it from being set at install time.Closes: #782