Bump version of glfw.

cmake/LibiglDownloadExternal.cmake

@@ -77,7 +77,7 @@ endfunction()
 function(igl_download_glfw)
 	igl_download_project(glfw
 		GIT_REPOSITORY https://github.com/glfw/glfw.git
-		GIT_TAG        58cc4b2c5c2c9a245e09451437dd6f5af4d60c84
+		GIT_TAG        5afcd0981bf2fe9b9550f24ba298857aac6c35c2
 	)
 endfunction()