[Macros] Add the correct RPATH flags to pure Swift host libraries, like the in-process plugin server

Also, make sure the in-process plugin server builds for Android.

Author: finagolfin

cmake/modules/AddPureSwift.cmake

@@ -193,6 +193,9 @@ function(add_pure_swift_host_library name)
   # Create the library.
   add_library(${name} ${libkind} ${APSHL_SOURCES})
   _add_host_swift_compile_options(${name})
+  if(APSHL_SHARED)
+    _set_pure_swift_link_flags(${name} "../../")
+  endif()
 
   set_property(TARGET ${name}
     PROPERTY BUILD_WITH_INSTALL_RPATH YES)

tools/swift-plugin-server/Sources/SwiftInProcPluginServer/InProcPluginServer.swift

@@ -17,6 +17,8 @@
 import Darwin
 #elseif canImport(Glibc)
 import Glibc
+#elseif canImport(Bionic)
+import Bionic
 #elseif canImport(Musl)
 import Musl
 #elseif canImport(ucrt)