Update the build system for pristine source directory builds. This

update is primarily work done by Larry Doolittle, but I did some
touchups of my own to make it work for me,
 -Erik

applets/busybox.sh

@@ -7,7 +7,7 @@ RAW=` \
 `
 test "${RAW}" != "" ||  exit
 cd ${2:-.}
-# I added in the extra "ls" so only source files that
-# actually exist will show up in the compile list.
-ls -1 $RAW 2>/dev/null | sed -e 's/\.c$/\.o/g'
+# By running $RAW through "ls", we avoid listing
+# source files that don't exist.
+ls $RAW 2>/dev/null | tr '\n' ' '
 

applets/usage.c

@@ -1,2 +1,2 @@
 #define USAGE_MESSAGES
-#include <usage.h>
+#include "usage.h"