* lib/_cygwin_S_IEXEC.c: Remove "const" from globals or they never seem to be

defined.  Wrap definitions in extern "C".  Include winsup.h to assure proper
definitions.
* dcrt0.cc (dll_crt0_1): Call stdio_init after premain run so that binmode.o,
etc., will control default stdio settings.
* dtable.cc (dtable::init_std_file_from_handle): Allow __fmode to force
binmode/textmode settings.  Default pipes to binmode.

winsup/cygwin/dtable.cc

@@ -165,7 +165,13 @@ void
 dtable::init_std_file_from_handle (int fd, HANDLE handle,
 				  DWORD myaccess, const char *name)
 {
-  int bin = binmode ? O_BINARY : 0;
+  int bin;
+
+  if (__fmode)
+    bin = __fmode;
+  else
+    bin = binmode ?: 0;
+
   /* Check to see if we're being redirected - if not then
      we open then as consoles */
   if (fd == 0 || fd == 1 || fd == 2)
@@ -190,6 +196,11 @@ dtable::init_std_file_from_handle (int fd, HANDLE handle,
 	  else
 	    name = "/dev/conin";
 	}
+      else if (GetFileType (handle) == FILE_TYPE_PIPE)
+	{
+	  if (bin == 0)
+	    bin = O_BINARY;
+	}
     }
 
   build_fhandler (fd, name, handle)->init (handle, myaccess, bin);