ada: Fix Ada.Text_IO.Delete with "encoding=8bits" form

Before this patch, on Windows, file with non-ASCII Latin1 names could be created
with Ada.Text_IO.Create by passing "encoding=8bits" through the Form
parameter and a Latin1-encoded string through the Name parameter,
but calling Ada.Text_IO.Delete on them raised an illegitimate exception.

This patch fixes this by making the wrappers of the unlink system function
aware of the encoding value passed through the Form parameter. It also
removes an unnecessary curly-brace block.

gcc/ada/

	* adaint.c (__gnat_unlink): Add new parameter and fix text
	conversion on Windows. Remove unnecessary curly braces.
	* adaint.h (__gnat_unlink): Add new parameter.
	* libgnat/i-cstrea.ads (unlink): Adapt to __gnat_unlink signature
	change.
	* libgnat/i-cstrea.adb (unlink): New Subprogram definition.
	* libgnat/s-crtl.ads (unlink): Adapt to __gnat_unlink signature
	change.
	* libgnat/s-fileio.adb (Delete): Pass encoding argument to unlink.

1 files changed, 2 insertions, 1 deletions

diff --git a/gcc/ada/libgnat/s-fileio.adb b/gcc/ada/libgnat/s-fileio.adb
index 931b68a..f55cdc7 100644
--- a/gcc/ada/libgnat/s-fileio.adb
+++ b/gcc/ada/libgnat/s-fileio.adb
@@ -350,6 +350,7 @@ package body System.File_IO is
       declare
          Filename : aliased constant String := File.Name.all;
          Is_Temporary_File : constant Boolean := File.Is_Temporary_File;
+         Encoding : constant CRTL.Filename_Encoding := File.Encoding;
 
       begin
          Close (File_Ptr);
@@ -360,7 +361,7 @@ package body System.File_IO is
          --  it's a temporary file, then closing it already unlinked it.
 
          if not Is_Temporary_File then
-            if unlink (Filename'Address) = -1 then
+            if System.CRTL.unlink (Filename'Address, Encoding) = -1 then
                raise Use_Error with OS_Lib.Errno_Message;
             end if;
          end if;