Auto merge of #50526 - moxian:just-fix, r=alexcrichton
Add a fallback for stacktrace printing for older Windows versions.
Some time ago we switched stack inspection functions of dbghelp.dll to their newer alternatives that also capture inlined context.
Unfortunately, said new alternatives are not present in older dbghelp.dll versions.
In particular Windows 7 at the time of writing has dbghelp.dll version 6.1.7601 from 2010, that lacks StackWalkEx and friends.
Tested on my Windows 7 - both msvc and gnu versions produce a readable stacktrace.
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