ReleaseDebugConfigSupport

[crazyhappygame]

Support multiple configuration
https://cmake.org/cmake/help/v3.16/variable/CMAKE_CONFIGURATION_TYPES.html#variable:CMAKE_CONFIGURATION_TYPES
https://cmake.org/cmake/help/v3.16/prop_tgt/MAP_IMPORTED_CONFIG_CONFIG.html

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[crazyhappygame]

@googlebot I signed it!

[googlebot]

CLAs look good, thanks!

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[crazyhappygame]

@stewartmiles could you merge it?

[crazyhappygame]

@a-maurice could you merge it?

[a-maurice]

Hi @crazyhappygame, sorry for the delay in getting back to you. Unfortunately, we have run into a couple roadblocks that have prevented us from setting up the repo to take in pull requests through GitHub (changes are being brought over from another repo, and it is currently one way, so this change would risk getting blown away). The change does look reasonable though, so if you are fine with it, I can replicate your change into that repo, and push it onto this.

[crazyhappygame]

Ok

[crazyhappygame]

@a-maurice @DellaBitta I checked the latest version 8.3 and those changes are still not there...
Could you merge it?