autotools: include meson build files in tarball

This adds the meson.build, meson_options.txt, and a few scripts that are
used exclusively by the meson build.

v2: - Remove accidentally included changes needed to test make dist with
      LLVM > 3.9

Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>
Acked-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

src/vulkan/Makefile.am

@@ -11,7 +11,10 @@ PYTHON_GEN = $(AM_V_GEN)$(PYTHON2) $(PYTHON_FLAGS)
 
 EXTRA_DIST = \
 	$(top_srcdir)/include/vulkan/vk_android_native_buffer.h \
-	util/gen_enum_to_str.py
+	util/gen_enum_to_str.py \
+	util/meson.build \
+	wsi/meson.build \
+	meson.build
 
 VULKAN_UTIL_SOURCES = \
 	$(VULKAN_UTIL_FILES) \