Merge pull request #439 from hpux735/master

Beginning support for ARMv7 hosts (RasPi, etc.)

stdlib/public/SwiftShims/LibcShims.h

@@ -28,7 +28,11 @@ namespace swift { extern "C" {
 
 // This declaration is not universally correct.  We verify its correctness for
 // the current platform in the runtime code.
+#if defined(__linux__) && defined (__arm__)
+typedef      int __swift_ssize_t;
+#else
 typedef long int __swift_ssize_t;
+#endif
 
 // General utilities <stdlib.h>
 // Memory management functions