Fix errors and omissions in last checkin

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5451 42af7a65-404d-4744-a932-0658087f49c3

Kconfig

@@ -7,7 +7,7 @@ mainmenu "Nuttx/$ARCH Configuration"
 
 config APPSDIR
 	string
-	default "../apps"
+	option env="APPSDIR"
 
 # This is a temporary kludge to let the build system know that we are using the new
 # configuration system