Fix compiling test runners for Android by using the full overlay

Author: finagolfin

Sources/Build/TestObservation.swift

@@ -132,8 +132,8 @@ public func generateTestObservationCode(buildParameters: BuildParameters) -> Str
         @_exported import WinSDK
         #elseif os(WASI)
         @_exported import WASILibc
-        #elseif canImport(Bionic)
-        @_exported import Bionic
+        #elseif canImport(Android)
+        @_exported import Android
         #else
         @_exported import Darwin.C
         #endif