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fix: build from source with MinGW-w64 gcc on Windows - #80

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NiJingzhe wants to merge 2 commits into

fix/mingw-dev-build

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fix: build from source with MinGW-w64 gcc on Windows#80
NiJingzhe wants to merge 2 commits into
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fix/mingw-dev-build

Commits on Nov 9, 2026
- cpp: define _USE_MATH_DEFINES for MinGW (OCCT headers gp_Dir.hxx & co. use M_PI; MinGW's math.h hides it under -std=c++20 / strict ANSI, and until now only MSVC got the define in ScadCompile)
  NiJingzhe
  committed
  93ec6e4
- tools: build_occt.py picks Ninja on Windows when a MinGW g++ is the compiler (with no cl on the path the default generator fell through to NMake, which a source build without MSVC does not have)
  NiJingzhe
  committed
  4b8574d