Cleanup CMake redundancies and use FILE_SET for headers -- only solution that installed non-flat header tree by transitive dependencies.

Author: cboulay

cmake/Installation.cmake

@@ -19,9 +19,6 @@ write_basic_package_version_file(
 
 # Define installation targets
 set(LSLTargets lsl)
-if(LSL_BUILD_STATIC)
-    list(APPEND LSLTargets lslobj lslboost)
-endif()
 
 # Install the targets and store configuration information.
 install(TARGETS ${LSLTargets}