capstone: Allow version 3.0.5 again

According to

 https://lore.kernel.org/qemu-devel/20200921174118.39352-1-richard.henderson@linaro.org/

there was an issue with Capstone 3.0.4 from Ubuntu 18, which was the reason
for bumping our minimum Capstone requirement to version 4.0. And indeed,
compiling with that version 3.0.4 from Ubuntu 18.04 still fails (after
allowing it with a hack in meson.build). But now that we've dropped support
for Ubuntu 18.04, that issue is not relevant anymore. Compiling with Capstone
version 3.0.5 (e.g. used in Ubuntu 20.04) seems to work fine, so let's allow
that version again.

Message-Id: <20220516145823.148450-3-thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

.gitlab-ci.d/buildtest.yml

@@ -42,6 +42,7 @@ build-system-ubuntu:
   variables:
     IMAGE: ubuntu2004
     CONFIGURE_ARGS: --enable-docs --enable-fdt=system --enable-slirp=system
+        --enable-capstone=system
     TARGETS: aarch64-softmmu alpha-softmmu cris-softmmu hppa-softmmu
       microblazeel-softmmu mips64el-softmmu
     MAKE_CHECK_ARGS: check-build

meson.build

@@ -2525,7 +2525,7 @@ capstone = not_found
 capstone_opt = get_option('capstone')
 if capstone_opt in ['enabled', 'auto', 'system']
   have_internal = fs.exists(meson.current_source_dir() / 'capstone/Makefile')
-  capstone = dependency('capstone', version: '>=4.0',
+  capstone = dependency('capstone', version: '>=3.0.5',
                         kwargs: static_kwargs, method: 'pkg-config',
                         required: capstone_opt == 'system' or
                                   capstone_opt == 'enabled' and not have_internal)