cmake: Add PUBLIC_HEADER DESTINATION for development rundir

Fix a warning thrown by CMake.

cmake/Modules/ObsHelpers.cmake

@@ -47,7 +47,11 @@ function(setup_binary_target target)
             EXCLUDE_FROM_ALL
     LIBRARY DESTINATION ${OBS_LIBRARY_DESTINATION}
             COMPONENT obs_${target}
-            EXCLUDE_FROM_ALL)
+            EXCLUDE_FROM_ALL
+    PUBLIC_HEADER
+      DESTINATION ${OBS_INCLUDE_DESTINATION}
+      COMPONENT obs_${target}
+      EXCLUDE_FROM_ALL)
 
   add_custom_command(
     TARGET ${target}