Android: add the stdlib RPATH when natively building on Android with Termux

This is the equivalent of the already-merged C++ Driver change in swiftlang/swift#69538.

Author: finagolfin

Sources/SwiftDriver/Jobs/GenericUnixToolchain+LinkerSupport.swift

@@ -127,8 +127,16 @@ extension GenericUnixToolchain {
  isShared: hasRuntimeArgs
  )
 
- if hasRuntimeArgs && targetTriple.environment != .android &&
- toolchainStdlibRpath {
+ // An exception is made for native Android environments like the Termux
+ // app as they build and run natively like a Unix environment on Android,
+ // so add the stdlib RPATH by default there.
+ #if os(Android)
+ let addRpath = true
+ #else
+ let addRpath = targetTriple.environment != .android
+ #endif
+
+ if hasRuntimeArgs && addRpath && toolchainStdlibRpath {
  // FIXME: We probably shouldn't be adding an rpath here unless we know
  // ahead of time the standard library won't be copied.
  for path in runtimePaths {