Fix Windows ARM64EC build issues and correct SIMD ARM NEON path (#2344) #1761

Job	Run time
macOS.1: Release / steps	11m 55s
macOS.2: Debug / steps	19m 17s
macOS.6: macos-15-intel / steps	29m 14s
macOS.4: threads=OFF / steps	8m 0s
macOS.7: macos-14 / steps	9m 15s
macOS.9: clang c++20 / steps	4m 24s
macOS.5: pkgconfig=OFF, examples=OFF, tools=OFF, docs=OFF, internal imath+deflate / steps	2m 33s
macOS.3: static / steps	9m 38s
macOS.10: gcc c++20 / steps	4m 10s
Windows.1: Release / steps	15m 25s
macOS.8: universal2 / steps	10m 57s
Windows.2: Debug / steps	34m 15s
Windows.4: threads=OFF / steps	12m 41s
Windows.3: static / steps	17m 37s
Windows.6: vfx2023 / steps	12m 20s
Windows.7: msys2-mingw32 / steps	21m 6s
Windows.10: msys2-ucrt64, static / steps	15m 59s
Windows.8: msys2-mingw32, static / steps	15m 25s
Windows.9: msys2-ucrt64 / steps	15m 1s
Linux.1: Release / steps	8m 44s
Linux.4: threads=OFF / steps	8m 1s
Windows.5: pkgconfig=OFF, examples=OFF, tools=OFF, docs=OFF, internal imath+deflate / steps	4m 6s
Windows.11: c++20 / steps	6m 9s
Linux.12: Fedora Rawhide / steps	17m 50s
Linux.7: clang / steps	10m 7s
Linux.9: cmake 4 / steps	16m 0s
Linux.5: pkgconfig=OFF, examples=OFF, tools=OFF, docs=OFF, internal deflate / steps	6m 13s
Linux.11: gcc c++20 / steps	8m 41s
Linux.2: Debug / steps	7m 8s
Linux.3: static / steps	8m 13s
Linux.10: clang c++20 / steps	10m 8s
Linux.8: vfx2023 / steps	8m 33s
Linux.6: custom namespace / steps	8m 16s
	6h 37m 21s

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