Merge rust-bitcoin/rust-bitcoin#2383: Remove DO_COV

1fe90223aa Remove DO_COV (Tobin C. Harding)

Pull request description:

  We have test coverage by way of `coveralls` now. Remove the old stale `DO_COV` stuff.

  Fix: #1853

ACKs for top commit:
  Kixunil:
    ACK 1fe90223aa
  apoelstra:
    ACK 1fe90223aa

Tree-SHA512: d54a0f4566e54f7f6b42474530d76049e64c6a79c6a38746f2cb9d455592f22747dcaaffb2fc8e39340c0861a5e1bfaad222459a7da4474093ed33f83b2f4fcd

.github/workflows/rust.yml

@@ -21,7 +21,6 @@ jobs:
         uses: dtolnay/rust-toolchain@stable
       - name: Running test script
         env:
-          DO_COV: true
           AS_DEPENDENCY: false
           DO_DOCS: true
           DO_FEATURE_MATRIX: true

bitcoin/contrib/test.sh

@@ -4,11 +4,6 @@ set -ex
 
 FEATURES="std rand-std rand serde secp-recovery bitcoinconsensus-std base64 bitcoinconsensus"
 
-if [ "$DO_COV" = true ]
-then
-    export RUSTFLAGS="-C link-dead-code"
-fi
-
 cargo --version
 rustc --version