Stop building broken code

We can bring it back later if we want.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

sys/src/cmd/aux/aux.json

@@ -7,8 +7,6 @@
 		],
 		"Install": "/$ARCH/bin/aux",
 		"Projects": [
-			"realemu/realemu.json",
-			"realemu/loadcom.json",
 			"vga/vga.json"
 		],
 		"SourceFilesCmd": [

sys/src/cmd/build.json

@@ -41,7 +41,6 @@
 			"exportfs/exportfs.json",
 			"ext2srv/build.json",
 			"faces/build.json",
-			"fossil/fossil.json",
 			"gdbserver/build.json",
 			"graph/build.json",
 			"grep/grep.json",
@@ -52,7 +51,6 @@
 			"iozone/fileop.json",
 			"ip/ip.json",
 			"jay/jay.json",
-			"jpg/build.json",
 			"lex/build.json",
 			"map/build.json",
 			"ndb/ndb.json",
@@ -73,11 +71,8 @@
 			"tbl/build.json",
 			"troff2html/build.json",
 			"units/build.json",
-			"usb/build.json",
 			"vac/build.json",
-			"venti/venti.json",
-			"vnc/build.json",
-			"zenith/build.json"
+			"vnc/build.json"
 		]
 	}
 ]