Add comment to OBJ_OUT and EXE_OUT
Add comment to OBJ_OUT and EXE_OUT

- useful when grepping these defs

google/or-tools,google/or-tools,google/or-tools,or-tools/or-tools,or-tools/or-tools,or-tools/or-tools,google/or-tools,or-tools/or-tools,or-tools/or-tools,or-tools/or-tools,google/or-tools,google/or-tools