Remove redundant SWIFT_HOST_VARIANT_ARCH_default branch

Author: MaxDesiatov

CMakeLists.txt

@@ -597,8 +597,6 @@ else()
     set(SWIFT_HOST_VARIANT_ARCH_default "powerpc64le")
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "s390x")
     set(SWIFT_HOST_VARIANT_ARCH_default "s390x")
-  elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "wasm32")
-    set(SWIFT_HOST_VARIANT_ARCH_default "wasm32")
   # FIXME: Only matches v6l/v7l - by far the most common variants
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "armv6l")
     set(SWIFT_HOST_VARIANT_ARCH_default "armv6")