Make the compiler_builtins dependency explicitly a wildcard one

As of cargo 1.79.0, our fake_root Cargo.toml is no longer valid due to
the change in rust-lang/cargo#13775 which
disallows a dependency without a version (or path, or something).

Previously, these were implicitly a "wildcard registry dependency" but
no longer. So do this explicitly to set the feature on the dependency
without any version requirement. The version will be specified by std.

[email protected]

Bug: 339172099
Change-Id: Ifbb78ced06d520755b683f49a6daca2cd0bcd333
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5525961
Commit-Queue: danakj <[email protected]>
Reviewed-by: Arthur Eubanks <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1298307}
NOKEYCHECK=True
GitOrigin-RevId: b71d1630b5f82988db7c26c0675648aa1a4563fd

rust/std/fake_root/Cargo.toml.template

@@ -17,6 +17,7 @@ features = [
 ]
 
 [dependencies.compiler_builtins]
+version = "*"
 features = ["weak-intrinsics"]
 
 [patch.crates-io]