Fold install(...) calls into set_output_dirs

cmake/installer.cmake

@@ -0,0 +1,17 @@
+get_directory_property(INSTALL_TARGETS DIRECTORY
+    ${CMAKE_SOURCE_DIR} BUILDSYSTEM_TARGETS)
+
+# Iterate over all the targets that have an INSTALL_DESTINATION
+# property (set by set_output_dirs) and call install() on them
+foreach(TARGET IN LISTS INSTALL_TARGETS)
+    get_target_property(DESTINATION ${TARGET} INSTALL_DESTINATION)
+    if(NOT DESTINATION)
+        continue()
+    endif()
+
+    install(TARGETS ${TARGET}
+        RUNTIME DESTINATION ${DESTINATION}
+        LIBRARY DESTINATION ${DESTINATION}
+        BUNDLE DESTINATION ${DESTINATION}
+        ARCHIVE EXCLUDE_FROM_ALL)
+endforeach()