Make KEXI examples be built and installed by default as it's likely expected by users
Summary:
+ add the COMPILING_EXAMPLES flag to KEXI config header for future use
FIXED-IN:3.1
Test Plan:
Build and install KEXI with BUILD_EXAMPLES ON.
Expected: PREFIX/share/examples/kexi/3.x/Simple_Database.kexi gets installed.
Reviewers: piggz
Reviewed By: piggz
Tags: KEXI
Differential Revision: https://phabricator.kde.org/D10565