Merge bitcoin-core/secp256k1#1758: ci: Drop workaround for Valgrind older than 3.20.0

c09519f0e3 ci: Drop workaround for Valgrind older than 3.20.0 (Hennadii Stepanov)

Pull request description:

  This is no longer needed in the current CI framework.

  If someone runs the CI scripts locally, it is reasonable to expect that they are using up-to-date tools, including Valgrind.

ACKs for top commit:
  real-or-random:
    ACK c09519f0e3

Tree-SHA512: ef840dc8fd6e29110e194e35139050d9720bf8b38e89497790dcf5f2f2ce603805b572fb7408b4ae47bda31289a05548671ac41923f6ab3d1fbf288855f058d0

ci/ci.sh

@@ -52,22 +52,6 @@ if [ -n "$WRAPPER_CMD" ]; then
     $WRAPPER_CMD --version
 fi
 
-# Workaround for https://bugs.kde.org/show_bug.cgi?id=452758 (fixed in valgrind 3.20.0).
-case "${CC:-undefined}" in
-    clang*)
-        if [ "$CTIMETESTS" = "yes" ] && [ "$WITH_VALGRIND" = "yes" ]
-        then
-            export CFLAGS="${CFLAGS:+$CFLAGS }-gdwarf-4"
-        else
-            case "$WRAPPER_CMD" in
-                valgrind*)
-                    export CFLAGS="${CFLAGS:+$CFLAGS }-gdwarf-4"
-                    ;;
-            esac
-        fi
-        ;;
-esac
-
 ./autogen.sh
 
 ./configure \