disas: Remove old libopcode arm disassembler

Capstone should be superior to the old libopcode disassembler, so
we can drop the old file nowadays.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220412165836.355850-3-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
6 files changed