PR29348, BFD_VMA_FMT wrong

PR29348, BFD_VMA_FMT wrong

There is a problem with my commit 0e3c1eebb2, which replaced
bfd_uint64_t with uint64_t: Some hosts typedef int64_t to long long
even when long is the same size as long long.  That confuses the code
choosing one of "l", "ll", or "I64" for BFD_VMA_FMT, and results in
warnings.

Write a direct configure test for the printf int64_t style instead.
This removes the last use of BFD_HOST_64BIT_LONG, so delete that.
Note that the changes to configure.com are pure guesswork.

	PR 29348
	* bfd-in.h (BFD_HOST_64BIT_LONG): Don't define.
	(BFD_VMA_FMT): Define using BFD_INT64_FMT when 64-bit.
	(bfd_vma, bfd_signed_vma): Move comments to 64-bit typedefs.
	* configure.ac (BFD_HOST_64BIT_LONG): Delete.
	(BFD_INT64_FMT): New config test.
	* configure.com: Update similarly.
	* Makefile.in: Regenerate.
	* bfd-in2.h: Regenerate.
	* configure: Regenerate.