scripts/gdb: If not building expat for gdb, disable

--with-expat=yes is unconditionally passed to the gdb configure
stage, instead of respecting the ${do_expat} decision.

Disable if not needed. Prevents error building canadian cross;

configure: error: expat is missing or unusable

Where configure stage fails to find expat on the host compiler.

Signed-off-by: "David Holsgrove" <david.holsgrove@xilinx.com>
Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
Message-Id: <4c4410a2a8aab24a29c5.1349244128@localhost.localdomain>
PatchWork-Id: 188711

diff -durN binutils-2.20.1.orig/ld/ldmain.c binutils-2.20.1/ld/ldmain.c

--- binutils-2.20.1.orig/ld/ldmain.c	2010-08-17 19:32:17.000000000 +0200

+++ binutils-2.20.1/ld/ldmain.c	2010-08-17 19:32:18.000000000 +0200

@@ -264,6 +264,7 @@

   link_info.keep_memory = TRUE;

   link_info.new_dtags = TRUE;

   link_info.combreloc = TRUE;

+  link_info.relro = TRUE;

   link_info.strip_discarded = TRUE;

   link_info.emit_hash = TRUE;

 #ifndef __mips__