Fix GCC version check for restrict.

We want to allow e.g. '17.0' (in-development version of 17) which
the __GNUC_MINOR_ check was unintentionally excluding.
--- a/src/zopflipng/lodepng/lodepng.cpp
+++ b/src/zopflipng/lodepng/lodepng.cpp
@@ -104,7 +104,7 @@ void lodepng_free(void* ptr);
 #endif
 
 /* restrict is not available in C90, but use it when supported by the compiler */
-#if (defined(__GNUC__) && defined(__GNUC_MINOR__) && (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1)) ||\
+#if (defined(__GNUC__) && defined(__GNUC_MINOR__) && (__GNUC__ >= 4 || ((__GNUC__ > 3) && (__GNUC_MINOR__ >= 1)))) ||\
     (defined(_MSC_VER) && (_MSC_VER >= 1400)) || (defined(__WATCOMC__) && (__WATCOMC__ >= 1250))
 #define LODEPNG_RESTRICT __restrict
 #else