Silencing -Wstack-protector (#2459)

imgui_draw.cpp

@@ -73,6 +73,7 @@ Index of this file:
 #pragma GCC diagnostic ignored "-Wunused-function"          // warning: 'xxxx' defined but not used
 #pragma GCC diagnostic ignored "-Wdouble-promotion"         // warning: implicit conversion from 'float' to 'double' when passing argument to function
 #pragma GCC diagnostic ignored "-Wconversion"               // warning: conversion to 'xxxx' from 'xxxx' may alter its value
+#pragma GCC diagnostic ignored "-Wstack-protector"          // warning: stack protector not protecting local variables: variable length buffer
 #if __GNUC__ >= 8
 #pragma GCC diagnostic ignored "-Wclass-memaccess"          // warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead
 #endif