bench: Restructure.

  - Move all benchmarks into a single binary. This prevents dead_code
    warnings for common functions not used in a specific benchmark, and
    makes adding new benchmarks a little less surprising.

  - Cargo would autimatically try to compile all .rs files in /benches
    as benchmarks. Prevent this with `autobenches = false`.

1 files changed, 1 insertions, 0 deletions

diff --git a/openpgp/benches/mod.rs b/openpgp/benches/mod.rs
new file mode 100644
index 00000000..a5961aa6
--- /dev/null
+++ b/openpgp/benches/mod.rs
@@ -0,0 +1 @@
+mod common;