plug-ins: Migrate pipewire and remoting plug-ins headers to public header

directory

Weston is also a user of the plug-ins, so make use of it. With this
change we unconditionally install the plug-in headers even though
libweston might not be built with support for them.

Suggested-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

compositor/main.c

@@ -63,8 +63,8 @@
 #include <libweston/backend-wayland.h>
 #include <libweston/windowed-output-api.h>
 #include <libweston/weston-log.h>
-#include "../remoting/remoting-plugin.h"
-#include "../pipewire/pipewire-plugin.h"
+#include <libweston/remoting-plugin.h>
+#include <libweston/pipewire-plugin.h>
 
 #define WINDOW_TITLE "Weston Compositor"
 /* flight recorder size (in bytes) */