Bug 1751331 - Use the mozbuild crate in glean. r=chutten

Differential Revision: https://phabricator.services.mozilla.com/D136564

Cargo.lock

@@ -1666,6 +1666,7 @@ dependencies = [
  "glean",
  "inherent",
  "log",
+ "mozbuild",
  "nsstring",
  "once_cell",
  "serde",

toolkit/components/glean/api/Cargo.toml

@@ -17,9 +17,10 @@ serde = { version = "1.0", features = ["derive"] }
 uuid = { version = "0.8.1", features = ["v4"] }
 xpcom = { path = "../../../../xpcom/rust/xpcom", optional = true }
 thin-vec = { version = "0.2.1", features = ["gecko-ffi"] }
+mozbuild = { version = "0.1", optional = true }
 
 [dev-dependencies]
 tempfile = "3.1.0"
 
 [features]
-with_gecko = ["xpcom", "nsstring"]
+with_gecko = ["xpcom", "nsstring", "mozbuild"]

toolkit/components/glean/api/src/metrics.rs

@@ -9,10 +9,7 @@
 //! 'toolkit/components/glean/metrics.yaml`.
 
 #[cfg(not(feature = "cargo-clippy"))]
-include!(concat!(
-    env!("MOZ_TOPOBJDIR"),
-    "/toolkit/components/glean/api/src/metrics.rs"
-));
+include!(mozbuild::objdir_path!("toolkit/components/glean/api/src/metrics.rs"));
 
 #[cfg(not(feature = "cargo-clippy"))]
 use crate::private::{EventMetric, EventRecordingError, ExtraKeys};

toolkit/components/glean/api/src/pings.rs

@@ -9,7 +9,4 @@
 //! 'toolkit/components/glean/pings.yaml`.
 
 #[cfg(not(feature = "cargo-clippy"))]
-include!(concat!(
-    env!("MOZ_TOPOBJDIR"),
-    "/toolkit/components/glean/api/src/pings.rs"
-));
+include!(mozbuild::objdir_path!("toolkit/components/glean/api/src/pings.rs"));