Add unix2dos as an allowed PATH tool

unix2dos is used instead of todos by some build servers in
development/build/tools/patch_windows_sdk.sh

Test: none
Change-Id: I04cb2258f71bebfc8792b7aa95643a45ffe3ec5c
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index 610af17..d6adc66 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -135,6 +135,7 @@
 	"true":      Allowed,
 	"uname":     Allowed,
 	"uniq":      Allowed,
+	"unix2dos":  Allowed,
 	"unzip":     Allowed,
 	"wc":        Allowed,
 	"which":     Allowed,