[Windows/MinGW64] Fixes for TBitArray dllimport, Mesh::DeleteMesh double free, and lazy init#229

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inyourblue-commits wants to merge 3 commits intoNGSolve:masterfrom

inyourblue-commits:fix-mingw

Commits on Dec 2, 2025

Fix windows/mingw32-w64 build issues
DoyongLee
committed

Commits on Dec 3, 2025

Fix DLL_HEADER export logic and add missing <mutex> include for MinGW
DoyongLee
committed
Merge branch 'NGSolve:master' into fix-mingw
inyourblue-commits
authored