remoting, pipewire: Install pipewire and remoting plug-ins headers

Required for other users of libweston.

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>

pipewire/meson.build

@@ -27,4 +27,5 @@ if get_option('pipewire')
 		install_dir: dir_module_libweston
 	)
 	env_modmap += 'pipewire-plugin.so=@0@;'.format(plugin_pipewire.full_path())
+	install_headers('pipewire-plugin.h', subdir: dir_include_libweston_install)
 endif

remoting/meson.build

@@ -29,4 +29,5 @@ if get_option('remoting')
 		install_dir: dir_module_libweston
 	)
 	env_modmap += 'remoting-plugin.so=@0@;'.format(plugin_remoting.full_path())
+	install_headers('remoting-plugin.h', subdir: dir_include_libweston_install)
 endif