binutils: arc: fix 0301-PATCH-check-ldrunpath-length.patch after version bump

This commit fixes another brown-paper-bag issue that I've introduced by
my following patch:
toolchain: Bump ARC tools to arc-2017.03-rc1
(5f8ef7e25c5cc5c2e4ae4c8b6e8caa029ddf9a94)

arc-2017.03-rc1 differs a bit from 2.28. And so corresponding
of-the-tree patch should be updated appropriately.

Fixes target binutils build for arc:
http://autobuild.buildroot.net/results/f67/f67c905979870936d8050a505b61186be6dad85d//

[Peter: tweak commit message]
Signed-off-by: Vlad Zakharov <vzakhar@synopsys.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/binutils/arc-2017.03-rc1/0301-PATCH-check-ldrunpath-length.patch

@@ -17,8 +17,8 @@ index d4837d0..937da8a 100644
  	      && command_line.rpath == NULL)
  	    {
  	      path = (const char *) getenv ("LD_RUN_PATH");
-+	      if ((lib_path) && (strlen (lib_path) == 0))
-+	        lib_path = NULL;
++	      if ((path) && (strlen (path) == 0))
++	        path = NULL;
  	      if (path
  		  && gld${EMULATION_NAME}_search_needed (path, &n, force))
  		break;