build-sys: autotools: Add meson build files to EXTRA_DIST

As we currently still generate our tarballs using autotools, let's make
sure the meson build system is distributed with the tarball.

Makefile.am

@@ -41,7 +41,31 @@ EXTRA_DIST = \
 	scripts/benchmarks/.gitignore \
 	src/.gitignore \
 	src/daemon/.gitignore \
-	src/pulse/.gitignore
+	src/pulse/.gitignore \
+	meson.build \
+	meson_options.txt \
+	man/meson.build \
+	po/meson.build \
+	shell-completion/bash/meson.build \
+	shell-completion/zsh/meson.build \
+	src/daemon/meson.build \
+	src/meson.build \
+	src/modules/alsa/meson.build \
+	src/modules/alsa/mixer/meson.build \
+	src/modules/bluetooth/meson.build \
+	src/modules/echo-cancel/meson.build \
+	src/modules/gsettings/meson.build \
+	src/modules/gsettings/post-install.sh \
+	src/modules/meson.build \
+	src/modules/oss/meson.build \
+	src/modules/raop/meson.build \
+	src/modules/rtp/meson.build \
+	src/pulsecore/meson.build \
+	src/pulse/meson.build \
+	src/tests/meson.build \
+	src/tests/test-daemon.meson.sh \
+	src/utils/meson.build \
+	vala/meson.build
 
 SUBDIRS = src doxygen man po