signal to kernel headers that time_t is 64-bit

linux/input.h and perhaps others use this macro to determine whether
the userspace time_t is 64-bit when potentially defining types in
terms of time_t and derived structures. the name __USE_TIME_BITS64 is
unfortunate; it really should have been in the __UAPI namespace. but
this is what was chosen back in v4.16 when first preparing input.h for
time64 userspace, presumably based on expectations about what the
glibc-internal features.h macro for time64 would be, and changing it
now would just put a new minimum version requirement on kernel
headers.

the __USE_TIME_BITS64 macro is not intended as a public interface. it
is purely an internal contract between libc and Linux uapi headers.

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