Removed warning in warning-ignore pragma :)

src/postprocessing/sqlite/extern/sqlite3.c

@@ -44,8 +44,10 @@
 // Disable gcc warnings
 #ifdef WALBERLA_CXX_COMPILER_IS_GNU
+#if __GNUC__  > 6
 #pragma GCC diagnostic ignored "-Wstringop-overflow"
 #endif
+#endif
 // Disable thread safety and load extension - compilable on all systems
 #define SQLITE_THREADSAFE 0