fixes #19713; Revert "Remove tlsEmulation enabled from Windows + GCC config" (#19119) (#20327)

* Revert "Remove tlsEmulation enabled from Windows + GCC config (#19119) [backport:1.6]"

This reverts commit 77b696c2c9.

* increase nimTlsSize to 48000

* enable for windows

* fixes tests

* fixes tlsEmulation:on

(cherry picked from commit 97259a5ab3)

compiler/nim.cfg

@@ -10,6 +10,7 @@ define:nimPreviewFloatRoundtrip
 
 @if windows:
   cincludes: "$lib/wrappers/libffi/common"
+  tlsEmulation:off
 @end
 
 define:useStdoutAsStdmsg

config/nim.cfg

@@ -156,6 +156,9 @@ nimblepath="$home/.nimble/pkgs/"
 # Configuration for the GNU C/C++ compiler:
 @if windows:
   #gcc.path = r"$nim\dist\mingw\bin"
+  @if gcc or tcc:
+    tlsEmulation:on
+  @end
 @end
 
 gcc.maxerrorsimpl = "-fmax-errors=3"

tests/config.nims

@@ -40,3 +40,5 @@ switch("define", "nimPreviewFloatRoundtrip")
 switch("define", "nimPreviewDotLikeOps")
 switch("define", "nimPreviewJsonutilsHoleyEnum")
 switch("define", "nimPreviewHashRef")
+when defined(windows):
+  switch("tlsEmulation", "off")