Fix a build warning

source/backend/plugin/CarlaPluginJuce.cpp

@@ -26,7 +26,6 @@
 #if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
 # pragma GCC diagnostic push
 # pragma GCC diagnostic ignored "-Wcast-qual"
-# pragma GCC diagnostic ignored "-Wclass-memaccess"
 # pragma GCC diagnostic ignored "-Wconversion"
 # pragma GCC diagnostic ignored "-Wdouble-promotion"
 # pragma GCC diagnostic ignored "-Weffc++"
@@ -35,6 +34,9 @@
 # pragma GCC diagnostic ignored "-Wsign-conversion"
 # pragma GCC diagnostic ignored "-Wundef"
 # pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
+# if __GNUC__ > 7
+#  pragma GCC diagnostic ignored "-Wclass-memaccess"
+# endif
 #endif
 
 #include "AppConfig.h"