package/libva-intel-driver: Fix build

Package needs autoreconf to produce a working configure script when building
without wayland support.

Also fix a typo in .mk file.

Fixes
http://autobuild.buildroot.net/results/606/6061216fa6e2f4323117bb6cfb2b77753a89a679/
http://autobuild.buildroot.net/results/76d/76dc4b670e2131b94bd0c5cff45ccafd5e45033c/
http://autobuild.buildroot.net/results/d6f/d6f624baa3dde4fc4051d361ddaf98ecc5c84134/
http://autobuild.buildroot.net/results/91f/91f36f32ef43be897fef9352f97cc07781c4035a/
http://autobuild.buildroot.net/results/951/9517bb6d2c05c27cad0b24a4443021a34babedbd/
http://autobuild.buildroot.net/results/405/405dfffbcfdaa485d0000dad655b0c112688a58f/
http://autobuild.buildroot.net/results/925/92538fb07d5226bb8c3d3cc5e1429560b2e621f3/
http://autobuild.buildroot.net/results/d15/d154ca018da0c21762ed70acda4f224c50a1d808/

This is caused by the fact that WAYLAND_SCANNER_RULES (which is provided by
wayland) is outside the wayland conditional.

For more details, see the upstream bug:

https://bugs.freedesktop.org/show_bug.cgi?id=79478



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>