samba: Fix build on Fedora 17

* Fedora 17 has /bin/perl, this causes samba build to put perl interpreter
  path as /bin/perl But we set perl location for target as /usr/bin/perl

* This mismatch of perl path causes failure of rootfs image creation:
  | error: Failed dependencies:
  | 	/bin/perl is needed by samba-3.6.8-r3.ppce5500

* MJ: fixed whitespaces

Signed-off-by: Ting Liu <b28495@freescale.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>