Don't pass large-address-aware flag to ld on Cygwin64.
Merge remote-tracking branch 'trac/u/jpflori/ticket/14333' into ticket/15679
Fix Singular build on Cygwin64.
Moved patch for Singular went untracked.
Merge remote-tracking branch 'trac/develop' into ticket/15679
Remove methods deprecated by #12544.
Trac #16164: Remove 12544 deprecations

URL: http://trac.sagemath.org/16164
Reported by: novoselt
Ticket author(s): Andrey Novoseltsev
Reviewer(s): Volker Braun
Trac #15679: Fixes for Singular on Cygwin64.

It seems ld on Cygwin64 does not look for .so extension and so fails to
find libsingular.so.
Indeed Singular is ill configured on Cygwin64.

This also disables omGetBacktrace on Cygwin64 as it seems to be broken.

The fixes here are jsut temporary as Singular4 build system is quite
different anyway.

URL: http://trac.sagemath.org/15679
Reported by: jpflori
Ticket author(s): Jean-Pierre Flori
Reviewer(s): Volker Braun
Trac #15678: R fails to build on Cygwin64 passing --large-address-aware to ld.

This is triggered on cygwin* but makes ld fail on cygwin64.

URL: http://trac.sagemath.org/15678
Reported by: jpflori
Ticket author(s): Jean-Pierre Flori
Reviewer(s): Volker Braun