Add private constructor to EGL15 class

Based on API review feedback, adding private constructor
and making class final.
Bug: 118296391
Test: make

Change-Id: Ie3e0a5fcb45c75f8d1b6b77883d02770cc208b55
diff --git a/opengl/tools/glgen/stubs/egl/EGL15Header.java-if b/opengl/tools/glgen/stubs/egl/EGL15Header.java-if
index 7409d93..859380f 100644
--- a/opengl/tools/glgen/stubs/egl/EGL15Header.java-if
+++ b/opengl/tools/glgen/stubs/egl/EGL15Header.java-if
@@ -20,7 +20,9 @@
  * EGL 1.5
  *
  */
-public class EGL15 {
+public final class EGL15 {
+
+    private EGL15() {};
 
     public static final int EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT            = 0x00000001;
     public static final int EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT   = 0x00000002;