configure: support 64 bit time_t on glibc.

There is a new feature in glibc: -D_TIME_BITS=64 makes time_t
64 bits wide, as part of a solution to Y2038.

Let's detect this together with _FILE_OFFSET_BITS in the same
test.

I've not tested this because I need a system with a
bleeding edge glibc that supports _TIME_BITS.

* configure (time_bits_define): New variable. Test which
searches some known command line options for 64 bit off_t
expanded to also check for 64 bit time_t. This complicates
the loop only slightly; it is much better than copy and
pasting the code

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