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Fix Clang build.

(cherry-picked from commit 384d6d56f)

The `__GNUC__` macro signals that GNU extensions are supported
by a compiler. Some versions of the clang compiler
(clang 10.0.0 targeting the MSVC ABI, for example) may not
define that macro. However, they still support the GNU
extensions. This patch fixes the build for those compilers
by checking the `__clang__` macro value alongside `__GNUC__`.

Part of the patch relevant to 'lj_err.c' is omitted since all
of the required changes were already backported in the scope
of the patch b6d285214 ('Cleanup
and enable external unwinding for more platforms.').

No tests were added since the issue is relevant for a very
specific type of very old clang 10.0.0, which is not really
relevant for us. However, clang builds are now added to our CI.

Maxim Kokryashkin:
* added the description for the problem

Part of tarantool/tarantool#9145

Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Reviewed-by: Sergey Kaplun <skaplun@tarantool.org>
Signed-off-by: Igor Munkin <imun@tarantool.org>

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