ego now builds and is used.

This needed lots of refactoring to ego --- not all platforms have ego descr
files, and ego will just crash if you invoke it without one. I think originally
it was never intended that these platforms would be used at -O2 or above.

Plats now only specify the ego descr file if they have one.

util/ego/ra/build.lua

@@ -0,0 +1,32 @@
+cprogram {
+	name = "makeitems",
+	srcs = { "./makeitems.c" }
+}
+
+normalrule {
+	name = "itemtab_h",
+	ins = {
+		"+makeitems",
+		matching(filenamesof("modules/src/em_data+lib"), "em_mnem%.h$"),
+		"./itemtab.src"
+	},
+	outleaves = { "itemtab.h" },
+	commands = {
+		"%{ins} > %{outs}"
+	}
+}
+
+cprogram {
+	name = "ra",
+	srcs = { "./ra*.c" },
+	deps = {
+		"util/ego/share+lib",
+		"modules/src/em_data+lib",
+		"h+emheaders",
+		"+itemtab_h",
+	},
+	vars = {
+		["+cflags"] = {"-DVERBOSE", "-DNOTCOMPACT"}
+	}
+}
+