anv: tweak the LDFLAGS

Copy/paste from the rest of mesa, but namely.
 - The module should be shared only.
 - We don't need the explicit ".so", as the vulkan loader will retrieve
the full filename from the json
 - No unresolved symbols in the final binary
 - Use the linker garbage collector to slim down the final binary.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/vulkan/Makefile.am

@@ -176,7 +176,12 @@ libvulkan_intel_la_LIBADD = $(WAYLAND_LIBS) \
         $(PER_GEN_LIBS)
 
 libvulkan_intel_la_LDFLAGS = \
-        -module -avoid-version -shared -shrext .so
+	-shared \
+	-module \
+	-no-undefined \
+	-avoid-version \
+	$(GC_SECTIONS) \
+	$(LD_NO_UNDEFINED)
 
 
 # Generate icd files. It would be nice to just be able to add these to