stdlib: android does not support FP80

Correct the maximal floating point width.  Although technically, Android
could support FP128 on AArch64, Swift does not currently support FP128.
For now, ensure that we use FP64 on Android.

Author: compnerd

stdlib/public/core/Policy.swift

@@ -100,7 +100,7 @@ public typealias StringLiteralType = String
 //===----------------------------------------------------------------------===//
 // Default types for unconstrained number literals
 //===----------------------------------------------------------------------===//
-#if !os(Windows) && (arch(i386) || arch(x86_64))
+#if !(os(Windows) || os(Android)) && (arch(i386) || arch(x86_64))
 public typealias _MaxBuiltinFloatType = Builtin.FPIEEE80
 #else
 public typealias _MaxBuiltinFloatType = Builtin.FPIEEE64