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.

plat/build.lua

@@ -20,6 +20,7 @@ definerule("ackfile",
 				"lang/pc/comp+pkg",
 				"plat/"..plat.."+tools",
 				"util/ack+pkg",
+				"util/ego+pkg",
 				"util/misc+pkg",
 				e.deps
 			},
@@ -67,7 +68,6 @@ definerule("ackprogram",
 				"plat/"..e.vars.plat.."+pkg",
 				"util/ack+pkg",
 				"util/led+pkg",
-				"util/amisc+pkg",
 				e.deps
 			},
 			_clibrary = acklibrary,

plat/linux386/descr

@@ -26,6 +26,7 @@ var C_LIB={PLATFORMDIR}/libc-ansi.a
 var CC_ALIGN=-Vr
 var OLD_C_LIB={C_LIB}
 var MACHOPT_F=-m10
+var EGO_PLAT_FLAGS=-M{EM}/share/ack/ego/{ARCH}.descr
 
 # Override the setting in fe so that files compiled for linux386 can see
 # the platform-specific headers.

plat/linux68k/descr

@@ -26,6 +26,7 @@ var C_LIB={PLATFORMDIR}/libc-ansi.a
 var CC_ALIGN=-Vr
 var OLD_C_LIB={C_LIB}
 var MACHOPT_F=-ml10
+var EGO_PLAT_FLAGS=-M{EM}/share/ack/ego/{ARCH}.descr
 
 # Override the setting in fe so that files compiled for linux68k can see
 # the platform-specific headers.

plat/pc86/descr

@@ -22,6 +22,7 @@ var PLATFORMDIR={EM}/share/ack/{PLATFORM}
 var CPP_F=-D__unix
 var ALIGN=-a0:1 -a1:1 -a2:1 -a3:1
 var MACHOPT_F=-m8
+var EGO_PLAT_FLAGS=-M{EM}/share/ack/ego/{ARCH}.descr
 
 # Override the setting in fe so that files compiled for this platform can see
 # the platform-specific headers.