remove WeakDictionary from CMakeLists

Author: tgymnich

Sources/TSCBasic/CMakeLists.txt

@@ -48,8 +48,7 @@ add_library(TSCBasic
   TerminalController.swift
   Thread.swift
   Tuple.swift
-  misc.swift
-  WeakDictionary.swift)
+  misc.swift)
 
 target_compile_options(TSCBasic PUBLIC
   # Don't use GNU strerror_r on Android.