Add stock 0.9.42 source.

This is from http://www.gnu.org/software/libmicrohttpd/ (and
was verified to match the source from a local mirror).

Bug: 23101922
Change-Id: I7efc9d5065b49b8957ce41bb6afd2ce1f39c7cac
diff --git a/acinclude.m4 b/acinclude.m4
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/acinclude.m4
@@ -0,0 +1 @@
+