* environ.cc (getwinenv): Make __stdcall.

(winenv): Ditto.
* malloc.cc (strdup): New function.  Occludes newlib version.
(_strdup_r): Ditto.
* winsup.h: Reflect above __stdcall changes.

winsup/cygwin/malloc_wrapper.cc

@@ -74,7 +74,7 @@ _realloc_r (struct _reent *, void *p, size_t size)
 extern "C" char *
 strdup_dbg (const char *s, const char *file, int line)
 {
-  char    *p;
+  char *p;
   export_malloc_called = 1;
   if ((p = (char *) malloc_dbg (strlen (s) + 1, file, line)) != NULL)
       strcpy (p, s);
@@ -177,6 +177,22 @@ export_calloc (size_t nmemb, size_t size)
   return res;
 }
 
+extern "C" char *
+strdup (const char *s)
+{
+  char *p;
+  size_t len = strlen (s) + 1;
+  if ((p = (char *) malloc (len)) != NULL)
+      memcpy (p, s, len);
+  return p;
+}
+
+extern "C" char *
+_strdup_r (struct _reent *, const char *s)
+{
+  return strdup (s);
+}
+
 /* We use a critical section to lock access to the malloc data
    structures.  This permits malloc to be called from different
    threads.  Note that it does not make malloc reentrant, and it does