Remove a broken assert in the generic build.
Added note about XOP brokenness.
Merge branch 'master' of https://github.com/wbhart/mpir
Recognise mingw64 from msys2.
Merge remote-tracking branch 'brian/master'
Fix a further issue affecting PPL, i.e. check for (U)INTMAX_MAX. Thanks to
JP Flori for the patch.
Merge branch 'master' of https://github.com/wbhart/mpir