[PROJ] PROJ 9.0.0RC1 & PROJ-data 1.9RC1

[Even Rouault]

>> installing the "libgtest-dev" package will solve that if you want to 
>> build & run the tests. Otherwise run cmake with -DBUILD_TESTING=OFF 
>> to disable them
>
> This was not required before.
Yes, because for autoconf, there was no downloading capabilities so we 
had to vendor googletest in the tree.
> test/unit/CMakeLists.txt causes the gtest download, but it seems 
> already to be present in test/googletest, shouldn't that be used instead?

Actually we should have completely removed test/googletest/src and 
test/googletest/include/gtest. They're a unused remain from autoconf era 
(I've just confirmed that by removing them from my tree). The CMake 
builds have never used them as far as I remember.


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