scripts/functions: Use stat correctly on non-GNU (BSD/Darwin) systems.

Call to get the directory mode depending on $CT_SYS_OS

yann.morin.1998@anciens.enib.fr:
CT_SYS_OS has changed on Linuxsystem, it only gets the kernel name "Linux",
and not the system name, 'GNU/'.

 --- binutils/ld/ldmain.c

 +++ binutils/ld/ldmain.c

 @@ -273,2 +273,5 @@ main (int argc, char **argv)

    link_info.emit_hash = TRUE;

 +#ifndef __mips__

 +  link_info.emit_gnu_hash = TRUE;

 +#endif

    link_info.callbacks = &link_callbacks;