Merge pull request #830 from Allenscript/fix_raspbian_compile_atomic_not_found_error

fix compile for raspbian on RaspberryPI 4B atomic not found error

src/os/linux/CMakeLists.txt

@@ -6,5 +6,5 @@ IF ((TD_LINUX_64) OR (TD_LINUX_32 AND TD_ARM))
   INCLUDE_DIRECTORIES(inc)
   AUX_SOURCE_DIRECTORY(src SRC)
   ADD_LIBRARY(os ${SRC})
-  TARGET_LINK_LIBRARIES(os m rt)
+  TARGET_LINK_LIBRARIES(os m rt atomic)
 ENDIF ()