Fix warnings on Windows, compiler option -ggdb3 option is nonexistent

Author: vaintroub

CMakeLists.txt

@@ -254,8 +254,10 @@ IF (ENABLE_GCOV AND NOT WIN32 AND NOT APPLE)
 ENDIF()
 
 MY_CHECK_C_COMPILER_FLAG(-ggdb3 HAVE_GGDB3)
-SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -ggdb3")
-SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -ggdb3")
+IF(HAVE_GGDB3)
+  SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -ggdb3")
+  SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -ggdb3")
+ENDIF()
 
 OPTION(ENABLED_LOCAL_INFILE
  "If we should should enable LOAD DATA LOCAL by default" ${IF_WIN})