Update for target-lexicon 0.12; Fixes RHBZ#1981348

cfg-expr-fix-metadata.diff

@@ -0,0 +1,11 @@
+--- cfg-expr-0.7.4/Cargo.toml	1970-01-01T00:00:00+00:00
++++ cfg-expr-0.7.4/Cargo.toml	2021-07-12T16:08:07.910502+00:00
+@@ -26,7 +26,7 @@
+ version = "1.6"
+ 
+ [dependencies.target-lexicon]
+-version = "0.11.2"
++version = "0.12"
+ optional = true
+ [dev-dependencies.difference]
+ version = "2.0"

rust-cfg-expr.spec

@@ -13,6 +13,10 @@ Summary:        Parser and evaluator for Rust `cfg()` expressions
 License:        MIT or ASL 2.0
 URL:            https://crates.io/crates/cfg-expr
 Source:         %{crates_source}
+# Initial patched metadata
+# * Update target-lexicon to version 0.12
+# https://github.com/EmbarkStudios/cfg-expr/pull/27
+Patch0:         cfg-expr-fix-metadata.diff
 
 ExclusiveArch:  %{rust_arches}
 %if %{__cargo_skip_build}