fixes #19713; Revert "Remove tlsEmulation enabled from Windows + GCC config" (#19119)

[ringabout]

This reverts commit 77b696c.

fixes #19713

Turning off tlsEmulation causes an implicit dependency on libwinpthreads.dll, which is a surprising regression for users using mingw on Windows. Because all working programs need to ship libwinthreads.dll on end-users's computers. By default, it shouldn't require libwinpthreads.dll, otherwise it might break the simplest programs written in Nim implicitly.

tlsEmulation doesn't work with the Nim compiler since it has a huge rope cache which is a threadvar variable. I turn off tlsEmulation for the Nim compiler because mingw always ship libwinpthreads.dll and mingw is a necessity for compiling a Nim program, it is fair to rely on that fact.

Summary

• turn on the tlsEmulation option for the Nim application which is consistent with former versions
• turn off the tlsEmulation option for the Nim compiler

[ringabout]

It seems to exceed thread local storage size and seems to need more thoughts.

too large thread local storage size requested,
use -d:"nimTlsSize=X" to setup even more or stop using unittest.nimFAILURE

[ringabout]

It is not surprising to see that the compilation needs more tls storage.

Two solutions:

• increase nimTlsSize to 60000
• don't make the rope cache a threadvar variable

typedef struct {tyProc__9axCnCRMUx32AHzFgBrzSMg localRaiseHook__system_2585;
tySequence__aNpJjaoUowCQc7fBn3wtDQ* threadDestructionHandlers__system_2834;
NI threadId__system_3016;
TFrame* framePtr__system_3070;
TSafePoint* excHandler__system_3071;
Exception* currException__system_3072;
GcFrameHeader* gcFramePtr__system_3073;
tyObject_GcHeap__1TRH1TZMaVZTnLNcIHuNFQ gch__system_5794;
tyObject_TimezonecolonObjectType___F8OvqlxXyGXRSiK9c1fCDVw* utcInstance__pureZtimes_1555;
tyObject_TimezonecolonObjectType___F8OvqlxXyGXRSiK9c1fCDVw* localInstance__pureZtimes_1556;
tySequence__sM4lkSb7zS6F7OVMvW9cffQ* ownArgv__pureZos_1617;
NIM_BOOL ownParsedArgv__pureZos_1618;
tyObject_PTerminalcolonObjectType___EcU8GhMNGo9bGDXbfqZ82og* gTerm__pureZterminal_17;
tyArray__b9c59bIypTigCSkwUynjAeZg cache__ropes_44;
tyObject_Gconfig__06LLZM9btHCEc6WftruBy5g gconfig__ast_987;
} NimThreadVars;

[ringabout]

It seems reasonable for the Nim compiler to rely on libwinpthreads.dll when using Mingw. Not with the application written in Nim.

[ringabout]

I have to remove threadvar for tlsEmulation because libraries using compiler apis will use up the thread local storage and fail.

[github-actions]

Thanks for your hard work on this PR!
The lines below are statistics of the Nim compiler built from 97259a5

Hint: mm: orc; threads: on; opt: speed; options: -d:release
164228 lines; 12.071s; 842.504MiB peakmem