Raspberry Pi backend now builds.

plat/rpi/include/build.lua

@@ -0,0 +1,27 @@
+include("plat/build.lua")
+
+headermap = {}
+packagemap = {}
+
+local function addheader(h)
+	headermap[h] = "./"..h
+	packagemap["$(PLATIND)/rpi/include/"..h] = "./"..h
+end
+
+addheader("ack/config.h")
+addheader("pi.h")
+addheader("sys/select.h")
+addheader("termios.h")
+addheader("unistd.h")
+
+acklibrary {
+	name = "headers",
+	hdrs = headermap
+}
+
+installable {
+	name = "pkg",
+	map = packagemap
+}
+
+