Cherry-pick: ICU-21461 uprops.h: remove unused gc macros #73
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This change cherry-picks the upstream fix to remove macros that use names which are reserved by the C++ standard.
There are upcoming changes to the MSVC STL headers which might use some of these reserved names, which causes conflicts.
Upstream ticket:
https://unicode-org.atlassian.net/browse/ICU-21461
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