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cmake: fix LTO build on Fedora

This patch is a follow-up to the commit
25af976f5 ("build: support cmake 4.0").
Since version 3.4, CMake doesn't add flags to export symbols from
executables without the ENABLE_EXPORTS target property, see CMP0065 [1]
for details.  Without this property, some unit C tests produce build
warnings with LTO optimization enabled (for example, on Fedora 39):

NO_WRAP
```
[ 72%] Linking CXX executable luaT_tuple_new.test
In function ‘rmean_collect’,
    inlined from ‘txn_complete_success’ at src/box/txn.c:836:2,
    inlined from ‘txn_limbo_complete’ at src/box/txn_limbo.c:205:3:
src/lib/core/rmean.c:65:9: error: ‘__atomic_add_fetch_8’ writing 8 bytes into a region of size 0 overflows the destination [-Werror=stringop-overflow=]
   65 |         __atomic_add_fetch(&rmean->stats[name].value[0], value, __ATOMIC_RELAXED);
      |         ^
In function ‘txn_limbo_complete’:
lto1: note: destination object is likely at address zero
```
NO_WRAP

The real reason should be investigated in the scope of #11517. The
compilation warning may be suppressed, but it may also mask the actual
problems in the future tests. The CMP0065 is removed from CMake version
4.0 [2]. Thus, this patch fixes the behaviour by setting the property
`ENABLE_EXPORTS` for unit tests directly.

[1]: https://cmake.org/cmake/help/latest/policy/CMP0065.html
[2]: https://cmake.org/cmake/help/latest/manual/cmake-policies.7.html#policies-introduced-by-cmake-3-4-removed-by-cmake-4-0

NO_DOC=build
NO_TEST=build
NO_CHANGELOG=build

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