Shared `libutf8_range` and `libutf8_validity` are missing so version

[mtelka]

When I build protobuf 29.3 with shared libraries using -DBUILD_SHARED_LIBS=ON then I see that both libutf8_range.so and libutf8_validity.so are missing the so version:

$ ls -l build/prototype/i386/usr/lib/amd64/
total 32094
drwxr-xr-x   4 marcel   staff          4 Feb 12 19:13 cmake
lrwxrwxrwx   1 marcel   staff         26 Feb 12 19:13 libprotobuf-lite.so -> libprotobuf-lite.so.29.3.0
-rwxr-xr-x   1 marcel   staff    1157304 Feb 12 18:46 libprotobuf-lite.so.29.3.0
lrwxrwxrwx   1 marcel   staff         21 Feb 12 19:13 libprotobuf.so -> libprotobuf.so.29.3.0
-rwxr-xr-x   1 marcel   staff    5829576 Feb 12 18:50 libprotobuf.so.29.3.0
lrwxrwxrwx   1 marcel   staff         19 Feb 12 19:13 libprotoc.so -> libprotoc.so.29.3.0
-rwxr-xr-x   1 marcel   staff    8569568 Feb 12 18:57 libprotoc.so.29.3.0
-rw-r--r--   1 marcel   staff     623000 Feb 12 18:45 libupb.a
-rwxr-xr-x   1 marcel   staff      12544 Feb 12 18:45 libutf8_range.so
-rwxr-xr-x   1 marcel   staff      12816 Feb 12 18:45 libutf8_validity.so
drwxr-xr-x   2 marcel   staff          6 Feb 12 19:13 pkgconfig
$