Use prebuilt m4 instead of system m4

Bug: 117561006
Test: treehugger
Change-Id: I588d867d95cc52963ce764018a9c09b26973c8c3
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index c9946e2..fcc4309 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -94,7 +94,7 @@
 	"java":     Allowed,
 	"javap":    Allowed,
 	"lsof":     Allowed,
-	"m4":       Allowed,
+	"m4":       Log,
 	"openssl":  Allowed,
 	"patch":    Allowed,
 	"pstree":   Allowed,