qt5location: fix build failure due to missing qt5base gui dependency

qt5location fails to build due to missing Qt5 Gui module.
In configure.json features.opengl is referred, but it is available only
if qt5base gui submodule is built.

Add BR2_PACKAGE_QT5BASE_GUI to qt5location Config.in to assure gui
submodule is built before qt5location.

Fixes:
http://autobuild.buildroot.org/results/1e1/1e12a819750c677c9ef204a324c8bf06212e5135/
http://autobuild.buildroot.org/results/223/223ec6565beba1ca73d4ff488296feec53656b40/
http://autobuild.buildroot.org/results/84f/84fe1c84e3537167ee3791e83c9fe2cc2805ccb5/
http://autobuild.buildroot.org/results/9c9/9c96d2106222e623a379f9995bd059725eb27769/
http://autobuild.buildroot.org/results/fa0/fa01513d28d896ca8819966c5b1ed5c35283e92f/
http://autobuild.buildroot.org/results/5d7/5d7333470c31b83c697218382dc77f74af86c666/
http://autobuild.buildroot.org/results/db7/db7b4c61bb41d32e0f7960c194588cd1559ff3f7/
http://autobuild.buildroot.org/results/2b7/2b71f186b8d67c4805393c9c016d641893d46220/
http://autobuild.buildroot.org/results/1e1/1e12a819750c677c9ef204a324c8bf06212e5135/



Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>