Add glPixelZoom() binding

Used by the high DPI client patch.

gl-natives/src/main/c/jaggl.c

@@ -2662,3 +2662,11 @@ JNIEXPORT void JNICALL Java_jaggl_opengl_glViewport(JNIEnv *env, jobject obj, ji
 
 	JAGGL_UNLOCK(env);
 }
+
+JNIEXPORT void JNICALL Java_jaggl_opengl_glPixelZoom(JNIEnv *env, jobject obj, jfloat xfactor, jfloat yfactor) {
+	JAGGL_LOCK(env);
+
+	glPixelZoom((GLfloat) xfactor, (GLfloat) yfactor);
+
+	JAGGL_UNLOCK(env);
+}

gl-natives/src/main/c/jaggl_opengl.h

@@ -1151,6 +1151,14 @@ JNIEXPORT void JNICALL Java_jaggl_opengl_glDrawArrays
 JNIEXPORT void JNICALL Java_jaggl_opengl_glLineWidth
   (JNIEnv *, jobject, jfloat);
 
+/*
+ * Class:     jaggl_opengl
+ * Method:    glPixelZoom
+ * Signature: (FF)V
+ */
+JNIEXPORT void JNICALL Java_jaggl_opengl_glPixelZoom
+  (JNIEnv *, jobject, jfloat, jfloat);
+
 #ifdef __cplusplus
 }
 #endif