Allow debugging with SOONG_DELVE=<listen addr>

Allow running Soong in a headless delve debugger by passing
SOONG_DELVE=<listen addr> in the environment.

Bug: 80165685
Test: SOONG_DELVE=:1234 m nothing
Change-Id: Icfc893c8a8354a9bbc99112d9c83259cb41906d1
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index e2c5043..a4be2ac 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -81,6 +81,7 @@
 	"bzip2":    Allowed,
 	"dd":       Allowed,
 	"diff":     Allowed,
+	"dlv":      Allowed,
 	"egrep":    Allowed,
 	"expr":     Allowed,
 	"find":     Allowed,