cargo: suppress warnings for cfg(buck_build)

This cfg value isn't understood by Cargo, so it needs to have the warning
suppressed by default. We could also add an entry to `build.rs` too, but not
every package has one.

To be used by upcoming diffs.

Signed-off-by: Austin Seipp <aseipp@pobox.com>

Cargo.toml

@@ -16,6 +16,9 @@ documentation = "https://martinvonz.github.io/jj/"
 categories = ["version-control", "development-tools"]
 keywords = ["VCS", "DVCS", "SCM", "Git", "Mercurial"]
 
+[workspace.lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(buck_build)'] }
+
 [workspace.dependencies]
 anyhow = "1.0.86"
 assert_cmd = "2.0.8"

cli/Cargo.toml

@@ -25,6 +25,9 @@ include = [
     "/tests/cli-reference@.md.snap"
 ]
 
+[lints]
+workspace = true
+
 [[bin]]
 name = "jj"
 path = "src/main.rs"

lib/Cargo.toml

@@ -21,6 +21,8 @@ include = [
     "!*.snap*",
 ]
 
+[lints]
+workspace = true
 
 [[test]]
 name = "runner"

lib/gen-protos/Cargo.toml

@@ -7,5 +7,8 @@ version = { workspace = true }
 edition = { workspace = true }
 license = { workspace = true }
 
+[lints]
+workspace = true
+
 [dependencies]
 prost-build = { workspace = true }

lib/proc-macros/Cargo.toml

@@ -13,6 +13,9 @@ readme = { workspace = true }
 
 include = ["/LICENSE", "/src/"]
 
+[lints]
+workspace = true
+
 [lib]
 proc-macro = true
 

lib/testutils/Cargo.toml

@@ -12,7 +12,8 @@ repository = { workspace = true }
 documentation = { workspace = true }
 readme = { workspace = true }
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[lints]
+workspace = true
 
 [dependencies]
 async-trait = { workspace = true }