GCC warnings fixes

imgui.cpp

@@ -577,6 +577,8 @@
 #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 "-Wcast-qual"                // warning: cast from type 'xxxx' to type 'xxxx' casts away qualifiers
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"        // warning: format not a string literal, format string not checked
+#pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
 #endif
 
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