vulkan/wsi/wayland: Move Wayland protocol from BUILT_SOURCES

autotools wants to have the BUILT_SOURCES ready as soon as it enters the
directory, even if they are not used. This meant the build failed if
wayland-protocols was not available on the system, even if it was not
enabled.

As BUILT_SOURCES cannot be used in a conditional (cf. 166852ee95), do
the same thing as EGL and manually encode the dependencies in the
Makefile.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Fixes: bfa22266cd ("vulkan/wsi/wayland: Add support for zwp_dmabuf")
Cc: Emil Velikov <emil.velikov@collabora.co.uk>
Reported-by: Dieter Nützel <Dieter@nuetzel-hh.de>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105211

src/vulkan/Makefile.am

@@ -58,7 +58,6 @@ AM_CPPFLAGS += \
 VULKAN_WSI_SOURCES += $(VULKAN_WSI_X11_FILES)
 endif
 
-BUILT_SOURCES += $(VULKAN_WSI_WAYLAND_GENERATED_FILES)
 CLEANFILES = $(BUILT_SOURCES)
 
 WL_DRM_XML = $(top_srcdir)/src/egl/wayland/wayland-drm/wayland-drm.xml
@@ -82,6 +81,10 @@ wsi/linux-dmabuf-unstable-v1-client-protocol.h : $(WL_DMABUF_XML)
 	$(AM_V_GEN)$(WAYLAND_SCANNER) client-header < $< > $@
 
 if HAVE_PLATFORM_WAYLAND
+wsi/linux-dmabuf-unstable-v1-protocol.lo: wsi/linux-dmabuf-unstable-v1-client-protocol.h
+wsi/wayland-drm-protocol.lo: wsi/wayland-drm-client-protocol.h
+wsi/wsi_common_wayland.lo: wsi/linux-dmabuf-unstable-v1-client-protocol.h wsi/wayland-drm-client-protocol.h
+
 AM_CPPFLAGS += \
 	-I$(top_builddir)/src/vulkan/wsi \
 	$(WAYLAND_CLIENT_CFLAGS) \