Drop Autotools build

We are officially switching to Meson as the default build system for
GTK+.

examples/application4/Makefile.am

@@ -1,31 +0,0 @@
-GTK_CFLAGS = 					\
-	-I$(top_srcdir)				\
-	$(GTK_DEP_CFLAGS)
-
-GTK_LIBS = 					\
-        $(top_builddir)/gtk/libgtk-4.la 	\
-        $(GTK_DEP_LIBS)
-
-
-noinst_PROGRAMS = exampleapp
-
-exampleapp_CFLAGS = $(GTK_CFLAGS)
-exampleapp_LDADD = $(GTK_LIBS)
-exampleapp_SOURCES = 				\
-	main.c 					\
-	exampleapp.c exampleapp.h 		\
-	exampleappwin.c exampleappwin.h 	\
-	resources.c
-
-BUILT_SOURCES = resources.c
-
-resources.c: exampleapp.gresource.xml window.ui app-menu.ui
-	$(AM_V_GEN) $(GLIB_COMPILE_RESOURCES) $(srcdir)/exampleapp.gresource.xml \
-		--target=$@ --sourcedir=$(srcdir) --generate-source
-
-EXTRA_DIST = 					\
-	window.ui 				\
-	app-menu.ui 				\
-	exampleapp.gresource.xml
-
--include $(top_srcdir)/git.mk