int64 configure test

Bruce Momjian wrote:

I have found a problem with int64 detection on MinGW. MinGW defines
int64_t but not int64, but configure only looks for int64:

AC_CACHE_CHECK([whether $1 is 64 bits], [Ac_cachevar],
[AC_TRY_RUN(
[typedef $1 int64;

What is the proper test? int64 or int64_t?

Sorry, wrong analysis. Something is still wrong with MinGW's detection
but this is not it. Let me continue testing.

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