Added alpha map fragment shader sources to the build includes.

utils/build/includes/common.json

@@ -131,6 +131,8 @@
 	"src/renderers/shaders/ShaderChunk/shadowmap_pars_fragment.glsl",
 	"src/renderers/shaders/ShaderChunk/skinning_pars_vertex.glsl",
 	"src/renderers/shaders/ShaderChunk/logdepthbuf_pars_fragment.glsl",
+	"src/renderers/shaders/ShaderChunk/alphamap_fragment.glsl",
+	"src/renderers/shaders/ShaderChunk/alphamap_pars_fragment.glsl",
 	"src/renderers/shaders/UniformsUtils.js",
 	"src/renderers/shaders/UniformsLib.js",
 	"src/renderers/shaders/ShaderLib.js",

utils/build/includes/webgl.json

@@ -121,6 +121,8 @@
 	"src/renderers/shaders/ShaderChunk/shadowmap_pars_fragment.glsl",
 	"src/renderers/shaders/ShaderChunk/skinning_pars_vertex.glsl",
 	"src/renderers/shaders/ShaderChunk/logdepthbuf_pars_fragment.glsl",
+	"src/renderers/shaders/ShaderChunk/alphamap_fragment.glsl",
+	"src/renderers/shaders/ShaderChunk/alphamap_pars_fragment.glsl",
 	"src/renderers/shaders/UniformsUtils.js",
 	"src/renderers/shaders/UniformsLib.js",
 	"src/renderers/shaders/ShaderLib.js",