binutils: Fix nativesdk ld.so search

Currently binutils in buildtools is searching for /etc/etc/ld.so.conf
which makes no sense. ld_sysconfdir already contains /etc so we need to
drop the /etc from the fixed string.

(From OE-Core rev: ccd28c418ab8390118d738fbe914395b5c2a1f75)

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

meta/recipes-devtools/binutils/binutils/0003-binutils-nativesdk-Search-for-alternative-ld.so.conf.patch

@@ -65,7 +65,7 @@ index eff6693e052..95787012b89 100644
        info.path = NULL;
        info.len = info.alloc = 0;
 -      tmppath = concat (ld_sysroot, prefix, "/etc/ld.so.conf",
-+      tmppath = concat (ld_sysconfdir, "/etc/ld.so.conf",
++      tmppath = concat (ld_sysconfdir, "/ld.so.conf",
  			(const char *) NULL);
        if (!ldelf_parse_ld_so_conf (&info, tmppath))
  	{