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MFC r255194 and prerequisites r229494,229496:
Introduce internal macros for __U/INT64_C to define the U/INT64_MAX/MIN
values properly. The previous definition only worked if __STDC_LIMIT_MACROS
and __STDC_CONSTANT_MACROS were defined at the same time.
Newer versions of gcc define __INT64_C and __UINT64_C, so avoid
redefining them if gcc provides them.
Applying r255194 fixes stable/9 host to allow source upgrading to the newer
versions with usr.bin/dtc included in bootstrap tools.
Approved by: imp (MFC to stable/9)
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