WebGLProgram: add USE_REVERSEDEPTHBUF define (#1273)

Author: Methuselah96

types/three/src/renderers/webgl/WebGLPrograms.d.ts

@@ -155,6 +155,7 @@ export interface WebGLProgramParameters {
 
     sizeAttenuation: boolean;
     logarithmicDepthBuffer: boolean;
+    reverseDepthBuffer: boolean;
 
     skinning: boolean;