Import new Android overlay

Author: finagolfin

Sources/System/Internals/CInterop.swift

@@ -20,6 +20,9 @@ import Glibc
 import Musl
 #elseif canImport(WASILibc)
 import WASILibc
+#elseif canImport(Android)
+@_implementationOnly import CSystem
+import Android
 #else
 #error("Unsupported Platform")
 #endif

Sources/System/Internals/Constants.swift

@@ -24,6 +24,8 @@ import Musl
 #elseif canImport(WASILibc)
 import CSystem
 import WASILibc
+#elseif canImport(Android)
+import Android
 #else
 #error("Unsupported Platform")
 #endif

Sources/System/Internals/Exports.swift

@@ -25,6 +25,9 @@ import Glibc
 import Musl
 #elseif canImport(WASILibc)
 import WASILibc
+#elseif canImport(Android)
+@_implementationOnly import CSystem
+import Android
 #else
 #error("Unsupported Platform")
 #endif
@@ -65,6 +68,11 @@ internal var system_errno: CInt {
   get { WASILibc.errno }
   set { WASILibc.errno = newValue }
 }
+#elseif canImport(Android)
+internal var system_errno: CInt {
+  get { Android.errno }
+  set { Android.errno = newValue }
+}
 #endif
 
 // MARK: C stdlib decls

Sources/System/Internals/Syscalls.swift

@@ -17,6 +17,8 @@ import Musl
 import WASILibc
 #elseif os(Windows)
 import ucrt
+#elseif canImport(Android)
+import Android
 #else
 #error("Unsupported Platform")
 #endif