Fix build errors

Author: cochcoder

deps/GLEW/GLEW.cmake

@@ -4,8 +4,6 @@ find_package(OpenGL QUIET REQUIRED)
 
 orcaslicer_add_cmake_project(
   GLEW
-  URL https://sourceforge.net/projects/glew/files/glew/2.2.0/glew-2.2.0.tgz
-  URL_HASH SHA256=d4fc82893cfb00109578d0a1a2337fb8ca335b3ceccf97b97e5cc7f08e4353e1
   SOURCE_DIR  ${CMAKE_CURRENT_LIST_DIR}/glew
   CMAKE_ARGS
     -DGLEW_EGL=${SLIC3R_EGL}