Improved gcc to inject nptl cross-compile tweaks through configcache

Note: libc_cv_forced_unwind=yes and libc_cv_c_cleanup=yes" config cache
      variables are needed for all archs if TLS is enabled, and the
      config cache approach seems to be more reliable than patching!

base/glibc/glibc.conf

@@ -64,6 +64,11 @@ if [ $SDECFG_PKG_GLIBC_TLS = 1 ]; then
 	var_append glibc_addons "," "nptl"
 	var_append extraconfopt " " "--with-tls"
 	var_append extraconfopt " " "--with-__thread"
+
+	if atstage cross ; then
+		var_append configcache ' ' "libc_cv_forced_unwind=yes"
+		var_append configcache ' ' "libc_cv_c_cleanup=yes"
+	fi
 else    
 	var_append glibc_addons "," "linuxthreads"
 	var_append extraconfopt " " "--without-__thread"

base/glibc/nptl-force-checks.patch.cross

@@ -1,42 +0,0 @@
-# --- SDE-COPYRIGHT-NOTE-BEGIN ---
-# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
-#
-# Filename: package/.../glibc/nptl-force-checks.patch.cross
-# Copyright (C) 2004 - 2006 The T2 SDE Project
-#
-# More information can be found in the files COPYING and README.
-#
-# This patch file is dual-licensed. It is available under the license the
-# patched project is licensed under, as long as it is an OpenSource license
-# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
-# of the GNU General Public License as published by the Free Software
-# Foundation; either version 2 of the License, or (at your option) any later
-# version.
-# --- SDE-COPYRIGHT-NOTE-END ---
-
-Yet another ugly glibc patch for the ugly glibc configure stuff. We
-force the nptl checks to succeed during the initial cross tool build,
-because without libc the compiler can not link programs that early ...
-
-  - Rene Rebe <rene@exactcode.de>
-
---- libc/nptl/sysdeps/pthread/configure.orig	2003-12-03 07:50:01.000000000 +0100
-+++ libc/nptl/sysdeps/pthread/configure	2004-10-31 00:02:50.526362392 +0200
-@@ -74,7 +74,7 @@
-   echo "$as_me: failed program was:" >&5
- sed 's/^/| /' conftest.$ac_ext >&5
- 
--libc_cv_forced_unwind=no
-+libc_cv_forced_unwind=yes
- fi
- rm -f conftest.err conftest.$ac_objext \
-       conftest$ac_exeext conftest.$ac_ext
-@@ -139,7 +139,7 @@
-   echo "$as_me: failed program was:" >&5
- sed 's/^/| /' conftest.$ac_ext >&5
- 
--libc_cv_c_cleanup=no
-+libc_cv_c_cleanup=yes
- fi
- rm -f conftest.err conftest.$ac_objext \
-       conftest$ac_exeext conftest.$ac_ext