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/broadcom/Makefile.am

@@ -46,7 +46,12 @@ check_PROGRAMS =
 TESTS =
 BUILT_SOURCES =
 CLEANFILES =
-EXTRA_DIST = $(BROADCOM_FILES)
+EXTRA_DIST = \
+	$(BROADCOM_FILES) \
+	meson.build \
+	cle/meson.build \
+	compiler/meson.build \
+	qpu/meson.build
 
 MKDIR_GEN = $(AM_V_at)$(MKDIR_P) $(@D)
 PYTHON_GEN = $(AM_V_GEN)$(PYTHON2) $(PYTHON_FLAGS)