Deb: Remove unnecessary manual libzstd1 dependency from RocksDB plugin

The Debian build tools add all run-time dependencies automatically. For the
mariadb-rocksdb-plugin the "${misc:Depends}, ${shlibs:Depends}" will become
(based on the build dependencies at build time):

  Depends: mariadb-server-10.4 (= 1:10.4.12-1), rocksdb-tools,
  libc6 (>= 2.29), liblz4-1 (>= 0.0~r130), libsnappy1v5 (>= 1.1.8),
  libstdc++6 (>= 7), libzstd1 (>= 1.3.3), zlib1g (>= 1:1.1.4)

There is no need to manually add run-time build dependencies. Only external
dependencies need to be defined, for example rocksdb-tools could come in
question for mariadb-plugin-rocksdb, and it will be eventually added when
downstream official Debian packaging is merged upstream in a later commit.

debian/autobake-deb.sh

@@ -77,7 +77,6 @@ fi
 if ! apt-cache madison libzstd-dev | grep 'libzstd-dev' >/dev/null 2>&1
 then
   sed '/libzstd-dev/d' -i debian/control
-  sed '/libzstd1/d' -i debian/control
 fi
 
 # The binaries should be fully hardened by default. However TokuDB compilation seems to fail on

debian/control

@@ -538,7 +538,6 @@ Description: Connect storage engine for MariaDB
 Package: mariadb-plugin-rocksdb
 Architecture: amd64 arm64 mips64el ppc64el
 Depends: mariadb-server-10.3 (= ${binary:Version}),
-         libzstd1,
          ${misc:Depends},
          ${shlibs:Depends}
 Breaks: mariadb-rocksdb-engine-10.2,