Fix build script as it was not working on some platforms

src/CMakeLists.txt

@@ -237,10 +237,6 @@ else ()
             COMMAND ln -sf OrcaSlicer orca-slicer
             WORKING_DIRECTORY "$<TARGET_FILE_DIR:OrcaSlicer>"
             VERBATIM)
-    else ()
-        add_custom_command(TARGET OrcaSlicer POST_BUILD
-            WORKING_DIRECTORY "$<TARGET_FILE_DIR:OrcaSlicer>"
-            VERBATIM)
     endif ()
     if (XCODE)
         # Because of Debug/Release/etc. configurations (similar to MSVC) the slic3r binary is located in an extra level

src/slic3r/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.13)
 project(libslic3r_gui)
 
 include(PrecompiledHeader)