autotools: remove support for the __int64 type. See #1313

__int64 was the 64bit type for Visual Studio before it added support for
"long long" with VS2013. I think this was used to build glib with mingw and
make the result usable for VS 6.0 which didn't support "long long" (??)

Given that newer MSVC links against a different crt and mixing is not supported
and everything supports "long long" nowadays just remove it.

This is also a cleanup for printf format changes needed for #1497
8 jobs for autotools-remove-__int64 in 8 minutes and 27 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #90072
cross-android_api21_arm64

00:02:34

passed #90073
cross-android_api28_arm64

00:07:08

passed #90074
cross-mingw64

00:07:27

passed #90071
fedora-x86_64

00:06:34

manual #90077
freebsd-11 allowed to fail manual
freebsd-11-x86_64
passed #90075
win32
msys2-mingw32

00:06:04

passed #90076
win32
vs2017-x64

00:06:00

 
  Coverage
passed #90078
coverage

00:00:55

73.4%