gpu: set jogamp.gluegen.TestTempDirExec=false

This prevents gluegen from testing if the tempdir is noexec, resulting
in it always using the tempdir. The test seems unreliable since we see
many users who fail the exec test but the plugin would work for
otherwise.

runelite-client/src/main/java/net/runelite/client/plugins/gpu/GpuPlugin.java

@@ -355,6 +355,8 @@ public class GpuPlugin extends Plugin implements DrawCallbacks
 					System.setProperty("jogl.debug", "true");
 				}
 
+				System.setProperty("jogamp.gluegen.TestTempDirExec", "false");
+
 				GLProfile.initSingleton();
 
 				invokeOnMainThread(() ->