[stdlib] Take out primary associated types on LazySequenceProtocol/LazyCollectionProtocol for now

(cherry picked from commit 063c845)

Author: lorentey

stdlib/public/core/LazyCollection.swift

@@ -10,8 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-public protocol LazyCollectionProtocol<Elements>
-: Collection, LazySequenceProtocol
+public protocol LazyCollectionProtocol: Collection, LazySequenceProtocol
 where Elements: Collection {}
 
 extension LazyCollectionProtocol {

stdlib/public/core/LazySequence.swift

@@ -128,7 +128,7 @@
 /// and discards the resulting array. Instead, use `reduce` for summing 
 /// operations, or `forEach` or a `for`-`in` loop for operations with side 
 /// effects.
-public protocol LazySequenceProtocol<Elements>: Sequence {
+public protocol LazySequenceProtocol: Sequence {
   /// A `Sequence` that can contain the same elements as this one,
   /// possibly with a simpler type.
   ///