Fix few issues found by 1.3.0 users:

• Fix google benchmark link error when compiling the bechmarks. Thanks @myd7349 (#961, f4c737ef4253d309453606a3c81861dfd572411e)
• Fix spdlog not printing message if SPDLOG_NO_THREAD_ID is defined. Thanks @scribam (#970, f4c737ef4253d309453606a3c81861dfd572411e)
• Fix depending on the order of inclusion of spdlog.h. Thanks @gocarlos (#959, 23fdc0eae426ac2efadf9f4bb1f43caae1667bc7)