qtbase.inc: Fix qtbase-tools runtime depencency on perl

* While building a custom rootfs using poky, meta-oe, meta-ti
  and meta-qt5 (all on Dylan branch), I got the following error:
  [...]
  Computing transaction...error: Can't install
    qtbase-tools-5.0.2-r2.0@armv7a_vfp_neon: no package provides /usr/bin/perl
  [...]
* syncqt is perl script with /usr/bin/perl shebang, that's why rpm
  was complaining (other package managers in OE doesn't check that)

Signed-off-by: Christian Gagneraud <chgans@gna.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>