Redo build system to properly use autotools and avoid compilation with apxs util.

tests/tfn/length.t

@@ -0,0 +1,44 @@
+### Empty
+{
+	type => "tfn",
+	name => "length",
+	input => "",
+	output => "0",
+	ret => 1,
+},
+
+
+### Basic normal and large
+{
+	type => "tfn",
+	name => "length",
+	input => "0123456789abcdef",
+	output => "16",
+	ret => 1,
+},
+# ENH: This sometimes fails w/4096 length
+#{
+#	type => "tfn",
+#	name => "length",
+#	input => ('x' x 8192),
+#	output => "8192",
+#	ret => 1,
+#},
+
+### With TAB
+{
+	type => "tfn",
+	name => "length",
+	input => "0123456789\tabcdef",
+	output => "17",
+	ret => 1,
+},
+
+### With NUL
+{
+	type => "tfn",
+	name => "length",
+	input => "Test\0Case",
+	output => "9",
+	ret => 1,
+},