Added fix for multiple versions of rand_core to benches.

Author: hpenne

benches/Cargo.toml

@@ -8,6 +8,11 @@ publish = false
 # Option (requires nightly Rust): experimental SIMD support
 simd_support = ["rand/simd_support"]
 
+# Force chacha20 to use the local rand_code to avoid compiling two different "rand_core"s.
+# This is necessary even if the specified versions are the same.
+[patch.crates-io]
+rand_core = { path = "../rand_core" }
+
 [dependencies]
 
 [dev-dependencies]