dist: drop unnecessary build time dependency for clang-devel

Seems like this package is not necessary for building cpp-rust-driver,
dropping.

Author: syuu1228

dist/debian/debian/control

@@ -6,7 +6,6 @@ Priority: optional
 Standards-Version: 4.6.0
 Build-Depends: debhelper-compat (= 11),
                libssl-dev,
-               libclang-dev,
                pkg-config,
                openssl,
                ca-certificates,

dist/redhat/scylla-cpp-rust-driver.spec

@@ -8,7 +8,7 @@ License:        LGPLv2.1
 URL:            https://github.com/scylladb/cpp-rust-driver
 Source0:        %{name}-%{driver_version}-%{driver_release}.tar
 BuildRequires:  openssl-devel
-BuildRequires:  clang-devel
+BuildRequires:  clang
 BuildRequires:  curl
 Conflicts:      scylla-cpp-driver