ICU-21461 uprops.h: remove unused gc macros #1555
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and some underused character constants
jefgen
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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 will use some of these reserved names, which causes conflicts. Upstream PR: unicode-org/icu#1555 Upstream ticket: https://unicode-org.atlassian.net/browse/ICU-21461
jefgen
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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 PR: unicode-org/icu#1555 Upstream ticket: https://unicode-org.atlassian.net/browse/ICU-21461
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and some underused character constants
https://unicode-org.atlassian.net/browse/ICU-21461
It turned out that the gc macros were not used. (They probably were used some time ago.)
There were also some adjacent character constants (as enum constants) that are less useful now that we can use Unicode character literals. I removed some that were used in only one or two places.