Fixed GL42 detection and added an @Optional so that AMD's beta driver works.

src/java/org/lwjgl/opengl/GLContext.java

@@ -221,7 +221,7 @@ public final class GLContext {
 			{ 1, 2, 3, 4, 5 },  // OpenGL 1
 			{ 0, 1 },           // OpenGL 2
 			{ 0, 1, 2, 3 },     // OpenGL 3
-			{ 0, 1 },           // OpenGL 4
+			{ 0, 1, 2 },        // OpenGL 4
 		};
 
 		for ( int major = 1; major <= GL_VERSIONS.length; major++ ) {

src/templates/org/lwjgl/opengl/GL42.java

@@ -127,6 +127,7 @@ public interface GL42 {
 	/** Returned in <params> by GetActiveUniform and GetActiveUniformsiv: */
 	int GL_UNSIGNED_INT_ATOMIC_COUNTER = 0x92DB;
 
+	@Optional(reason = "AMD's beta 4.2 driver (11.8) does not expose this")
 	@StripPostfix("params")
 	void glGetActiveAtomicCounterBufferiv(@GLuint int program, @GLuint int bufferIndex, @GLenum int pname, @Check("1") @OutParameter IntBuffer params);