[winxed] update to winxed 1.10.-1
[config] omit -fpermissive on cygwin gcc

Fixes GH #1137
trace: macrofy trace_pmc_flags_dump
32bit: use SIZE_FMT for size_t format args
[pmc] Object.invoke as vtable override: fix unstable self heuristic

Change experimental usage of vtable overridden subs.
Only push self if the sub is a method, otherwise replace it.

Closes #1013. Thanks to Zefram