Upgrade rust/crates/once_cell to 1.8.0

Test: make
Change-Id: I5adb9aa89db970ff857566c9372bf5d498b09077
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 259e3b0..a9c1a5c 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,6 +1,6 @@
 [package]
 name = "once_cell"
-version = "1.7.2"
+version = "1.8.0"
 authors = ["Aleksey Kladov <aleksey.kladov@gmail.com>"]
 license = "MIT OR Apache-2.0"
 edition = "2018"
@@ -13,7 +13,7 @@
 keywords = ["lazy", "static"]
 categories = ["rust-patterns", "memory-management"]
 
-exclude = ["*.png", "*.svg", "/Cargo.lock.min", "/.travis.yml", "/run-miri-tests.sh", "rustfmt.toml"]
+exclude = ["*.png", "*.svg", "/Cargo.lock.msrv", "/.travis.yml", "/run-miri-tests.sh", "rustfmt.toml"]
 
 [workspace]
 members = ["xtask"]