simplified patch based on
http://git.yoctoproject.org/cgit.cgi/poky/plain/meta/recipes-devtools/binutils/binutils/0009-warn-for-uses-of-system-directories-when-cross-linki.patch
just detect and skip system directories if used by mistake

linker output in case of using /usr/lib path:
/data/LibreELEC.tv/build.LibreELEC-Generic.x86_64-8.0-devel/toolchain/lib/gcc/x86_64-libreelec-linux-gnu/6.2.0/../../../../x86_64-libreelec-linux-gnu/bin/ld: warning: library search path "/usr/lib" is unsafe for cross-compilation, ignore it

From 7ab8e318659eb5d9adc758c78d084a95560b93fd Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Fri, 15 Jan 2016 06:31:09 +0000
Subject: [PATCH 09/13] warn for uses of system directories when cross linking

--- a/ld/ldfile.c
+++ b/ld/ldfile.c
@@ -314,6 +314,17 @@ ldfile_add_library_path (const char *nam
   if (!cmdline && config.only_cmd_line_lib_dirs)
     return;
 
+  /* skip those directories when linking */
+  if ((!strncmp (name, "/lib", 4)) ||
+      (!strncmp (name, "/usr/lib", 8)) ||
+      (!strncmp (name, "/usr/local/lib", 14)) ||
+      (!strncmp (name, "/usr/X11R6/lib", 14)))
+  {
+    einfo (_("%P: warning: library search path \"%s\" is unsafe for "
+             "cross-compilation, ignore it\n"), name);
+    return;
+  }
+
   new_dirs = (search_dirs_type *) xmalloc (sizeof (search_dirs_type));
   new_dirs->next = NULL;
   new_dirs->cmdline = cmdline;
