Merge #18429: build: remove double LIBBITCOIN_SERVER from bench-Makefile

1f97b69ba2 build: remove double LIBBITCOIN_SERVER from bench-Makefile (Harris)

Pull request description:

  This PR removes the redundant **LIBBITCOIN_SERVER** linking from bench's Makefile.
  This PR is similar to https://github.com/bitcoin/bitcoin/pull/17910

  Originally, this PR was part of https://github.com/bitcoin/bitcoin/pull/18377, which later got replaced by a better one https://github.com/bitcoin/bitcoin/pull/18397 written by **hebasto**.

ACKs for top commit:
  Empact:
    Code Review ACK 1f97b69ba2
  theStack:
    ACK 1f97b69ba2
  hebasto:
    ACK 1f97b69ba2

Tree-SHA512: e43035262361d4458a7dcfc920445540f19301387814cde1be0539c936fc20da0dcbe49e5ea25385e6d36d9639515b7a4171228223da568d93427e9c32810945

src/Makefile.bench.include

@@ -48,7 +48,6 @@ bench_bench_bitcoin_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 bench_bench_bitcoin_LDADD = \
   $(LIBBITCOIN_SERVER) \
   $(LIBBITCOIN_WALLET) \
-  $(LIBBITCOIN_SERVER) \
   $(LIBBITCOIN_COMMON) \
   $(LIBBITCOIN_UTIL) \
   $(LIBBITCOIN_CONSENSUS) \