CMake inconsistency build interface pushes date::tz, install interface pushes date::date-tz

Hi,



First the disclaimer ;-) I am by no means an expert in cmake, I use it because it makes my life somewhat easier.



I've installed the date project with the following cmake line:

```bash

cmake -DUSE_SYSTEM_TZ_DB=ON -DBUILD_SHARED_LIBS=ON -DBUILD_TZ_LIB=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_FLAGS="-stdlib=libc++" ..

make && sudo make install

```

After that I tried to import the library using

```cmake

find_package(date REQUIRED)

target_link_libraries(main PUBLIC date::tz)

```

This gave an error, after asking on #cmake the target seems to be date::date-tz instead of date::tz. One of the comments is:



the build interface pushes date::tz, the install interface pushes date::date-tz .. one of those is not right



Regards, Matthijs

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