Change ${CMAKE_BINARY_DIR} to ${CMAKE_CURRENT_BINARY_DIR}
Change ${CMAKE_BINARY_DIR} to ${CMAKE_CURRENT_BINARY_DIR}

- if building as a submodule of another repository, installation of pkg-config files can fail because they may not be in the top-level binary directory

- changing ${CMAKE_BINARY_DIR} to ${CMAKE_CURRENT_BINARY_DIR} allow CMake to find the files for installation

Streamlet/GoogleHelper,Streamlet/GoogleHelper,Streamlet/GoogleHelper,Streamlet/GoogleHelper,Streamlet/GoogleHelper