fixup! add realsense2-all, a single library bundle

Author: maloel

src/realsense2-all.cmake

@@ -75,6 +75,9 @@ function( bundle_static_library target_name bundle_name )
 
         set( ar_tool ${CMAKE_AR} )
         if( CMAKE_INTERPROCEDURAL_OPTIMIZATION )
+            # This is link-time-optimization (LTO): the archive tool can be something else,
+            # depending on the compiler. But "CMake doesn't seem to honor CMAKE_AR when
+            # CMAKE_INTERPROCEDURAL_OPTIMIZATION is set to TRUE"
             set( ar_tool ${CMAKE_CXX_COMPILER_AR} )
         endif()