automake: Convert src/Makefile to automake.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
diff --git a/src/Makefile.am b/src/Makefile.am
new file mode 100644
index 0000000..d6a7946
--- /dev/null
+++ b/src/Makefile.am
@@ -0,0 +1,4 @@
+SUBDIRS=$(SRC_DIRS)
+
+all-local:
+	$(MKDIR_P) $(top_builddir)/$(LIB_DIR)