makefiles: Add missing dist files

https://bugzilla.gnome.org/show_bug.cgi?id=793560

Makefile.am

@@ -33,4 +33,8 @@ EXTRA_DIST = \
 	meson.build \
 	meson_options.txt \
 	config.h.meson \
-	scripts/pythondetector
+	pygst.py.in \
+	scripts/pythondetector \
+	examples/plugins/python/sinkelement.py \
+	examples/plugins/python/identity.py \
+	examples/helloworld.py

gi/Makefile.am

@@ -1,4 +1,5 @@
 SUBDIRS = overrides
 
 EXTRA_DIST = \
+	__init__.py \
 	meson.build

gi/overrides/Makefile.am

@@ -9,8 +9,10 @@ pygioverrides_PYTHON = Gst.py GstPbutils.py
 pygioverridesexecdir = $(PYGI_OVERRIDES_DIR)
 
 EXTRA_DIST = \
+	__init__.py \
 	meson.build \
-	Gst.py
+	Gst.py \
+	GstPbutils.py
 
 AM_CPPFLAGS = $(PYTHON_INCLUDES)
 

testsuite/Makefile.am

@@ -6,11 +6,14 @@ tests =	\
 	test_types.py
 
 EXTRA_DIST = \
-	meson.build \
 	__init__.py \
+	cleanup.py \
 	common.py \
-	runtests.py \
+	gstpython.supp \
+	meson.build \
 	overrides_hack.py \
+	python.supp \
+	runtests.py \
 	$(tests)
 
 clean-local: