Suppress 'register storage class is deprecated' warning in boost dependency library

CMakeLists.txt

@@ -155,7 +155,7 @@ else()
   else()
     set(ARCH_FLAG "-march=${ARCH}")
   endif()
-  set(WARNINGS "-Wall -Wextra -Wpointer-arith -Wundef -Wvla -Wwrite-strings -Wno-error=extra -Wno-error=deprecated-declarations -Wno-error=sign-compare -Wno-error=strict-aliasing -Wno-error=type-limits -Wno-unused-parameter -Wno-error=unused-variable -Wno-error=undef -Wno-error=uninitialized")
+  set(WARNINGS "-Wall -Wextra -Wpointer-arith -Wundef -Wvla -Wwrite-strings -Wno-error=extra -Wno-error=deprecated-declarations -Wno-error=sign-compare -Wno-error=strict-aliasing -Wno-error=type-limits -Wno-unused-parameter -Wno-error=unused-variable -Wno-error=undef -Wno-error=uninitialized -Wno-deprecated-register")
   if(NOT MINGW)
     set(WARNINGS "${WARNINGS} -Werror")
   endif()
@@ -257,4 +257,4 @@ add_subdirectory(src)
 
 if(BUILD_TESTS)
   add_subdirectory(tests)
-endif()
+endif()