Revert "Fix build on MSVC 16.6.0."

This reverts commit e4f4dad.

MSVC 16.6.* has a critical bug if Qt is compiled with it. See:

https://developercommunity.visualstudio.com/content/problem/1072443/
static-structs-with-atomics-initialization-regress.html

external/ranges/CMakeLists.txt

@@ -19,8 +19,8 @@ else()
     if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
         target_compile_options(external_ranges
         INTERFACE
-            /Zc:preprocessor # need for range-v3 see https://github.com/ericniebler/range-v3#supported-compilers
-            /wd5105 # needed for `/Zc:preprocessor`, suppressing C5105 "macro expansion producing 'defined' has undefined behavior"
+            /experimental:preprocessor # need for range-v3 see https://github.com/ericniebler/range-v3#supported-compilers
+            /wd5105 # needed for `/experimental:preprocessor`, suppressing C5105 "macro expansion producing 'defined' has undefined behavior"
         )
     endif()
 endif()