Remove redundant include(StdlibOptions)

Author: MaxDesiatov

CMakeLists.txt

@@ -163,10 +163,6 @@ set(SWIFT_HOST_VARIANT_ARCH "${SWIFT_HOST_VARIANT_ARCH_default}" CACHE STRING
 # This is primarily to support building smaller or faster project files.
 #
 
-# Subsequent options may refer to `StdlibOptions`, which have to be defined first.
-list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/stdlib/cmake/modules)
-include(StdlibOptions)
-
 option(SWIFT_APPEND_VC_REV
   "Embed the version control system revision in Swift"
   TRUE)