binutils-cross: Remove exec_prefix from the linker search path

We don't put target libs into a native/cross ${exec_prefix} but having
this in the default search path means all linker scripts have to be relocated.
This is a considerable chunk of files to create multiple copies of for no good
reason.

Instead, patch out the paths we don't need.

(From OE-Core rev: 20816eb5398512652c971a37589a2ca28ffd3d68)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/binutils/binutils-cross.inc

@@ -7,9 +7,14 @@ BPN = "binutils"
 INHIBIT_DEFAULT_DEPS = "1"
 INHIBIT_AUTOTOOLS_DEPS = "1"
 
+SRC_URI += "file://no-tooldirpaths.patch"
+
+# Specify lib-path else we use a load of search dirs which we don't use
+# and mean the linker scripts have to be relocated.
 EXTRA_OECONF += "--with-sysroot=${STAGING_DIR_TARGET} \
                 --disable-install-libbfd \
                 --enable-poison-system-directories \
+                --with-lib-path==${target_base_libdir}:=${target_libdir} \
                 "
 do_install () {
 	oe_runmake 'DESTDIR=${D}' install

meta/recipes-devtools/binutils/binutils/no-tooldirpaths.patch

@@ -0,0 +1,47 @@
+We don't place target libraries within ${exec_prefix}, we'd always place these
+within the target sysroot within the standard library directories. Worse, the
+append_to_lib_path code prefixes these paths with the sysroot which makes even
+less sense.
+
+These directories therefore don't make sense in our case and mean we have to 
+relocate all the linker scripts if they're present. Dropping them 
+gives a reasonable performance improvement/simplification.
+
+Upstream-Status: Inappropriate
+
+RP 2017/01/30
+
+Index: git/ld/genscripts.sh
+===================================================================
+--- git.orig/ld/genscripts.sh
++++ git/ld/genscripts.sh
+@@ -189,29 +189,6 @@ append_to_lib_path()
+   fi
+ }
+ 
+-# Always search $(tooldir)/lib, aka /usr/local/TARGET/lib when native
+-# except when LIBPATH=":".
+-if [ "${LIB_PATH}" != ":" ] ; then
+-  libs=
+-  if [ "x${TOOL_LIB}" = "x" ] ; then
+-    if [ "x${NATIVE}" = "xyes" ] ; then
+-      libs="${exec_prefix}/${target_alias}/lib"
+-    fi
+-  else
+-    # For multilib'ed targets, ensure both ${target_alias}/lib${LIBPATH_SUFFIX}
+-    # and ${TOOL_LIB}/lib${LIBPATH_SUFFIX} are in the default search path,
+-    # because 64bit libraries may be in both places, depending on
+-    # cross-development setup method (e.g.: /usr/s390x-linux/lib64
+-    # vs. /usr/s390-linux/lib64)
+-    case "${NATIVE}:${LIBPATH_SUFFIX}:${TOOL_LIB}" in
+-      :* | *::* | *:*:*${LIBPATH_SUFFIX}) ;;
+-      *) libs="${exec_prefix}/${target_alias}/lib${LIBPATH_SUFFIX}" ;;
+-    esac
+-    libs="${exec_prefix}/${TOOL_LIB}/lib ${libs}"
+-  fi
+-  append_to_lib_path ${libs}
+-fi
+-
+ if [ "x${LIB_PATH}" = "x" ] && [ "x${USE_LIBPATH}" = xyes ] ; then
+   libs=${NATIVE_LIB_DIRS}
+   if [ "x${NATIVE}" = "xyes" ] ; then