Fix path to sys_util and tempfile.

This is needed for cargo2android.py to work properly for crosvm.

Bug: 204072128
Test: ./all2android.sh under external/crosvm
Change-Id: Ia4e1ad62564f3b1e082d0ae7fd65900b0fbade2f
diff --git a/Cargo.toml b/Cargo.toml
index 94a7f45..047be10 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,8 +21,8 @@
 [dependencies]
 bitflags = ">=1.0.1"
 libc = ">=0.2.39"
-sys_util = "*"
-tempfile = "*"
+sys_util = { path = "../../../external/crosvm/sys_util" }
+tempfile = { path = "../../../external/crosvm/tempfile" }
 vm-memory = { version = "0.2.0", optional = true }
 
 [dev-dependencies]