Remove dead install variable

CMakeLists.txt

@@ -305,14 +305,7 @@ if(Python3_FOUND)
     # The script configures and drives its own instrumented build tree (under
     # ${CMAKE_BINARY_DIR}/coverage) so this build's binaries and its coverage
     # counters can never be stale or half-instrumented. Reports via gcov.
-    # Keep the convenient generic name at the top level, but namespace it when
+    add_custom_target(coverage
-    # embedded so a parent project can provide its own coverage target.
-    if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
-        set(AKERR_COVERAGE_TARGET coverage)
-    else()
-        set(AKERR_COVERAGE_TARGET akerror_coverage)
-    endif()
-    add_custom_target(${AKERR_COVERAGE_TARGET}
         COMMAND ${Python3_EXECUTABLE}
                 ${CMAKE_CURRENT_SOURCE_DIR}/scripts/coverage.py
                 --source-root ${CMAKE_CURRENT_SOURCE_DIR}
@@ -344,7 +337,6 @@ if(Python3_FOUND)
     )
 endif()
 
-set(main_lib_dest "lib/my_library-${MY_LIBRARY_VERSION}")
 install(TARGETS akerror
   EXPORT akerrorTargets
   ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}