[flang] Fix ISO_C_BINDING type sizes for Windows (#172034) Fix several ISO_C_BINDING type parameters for Windows compatibility: - c_long/c_unsigned_long: Use 32-bit on Windows (LLP64 data model) - c_long_double: Use 64-bit (kind=8) on Windows ARM64 https://github.com/Windows-on-ARM-Experiments/mingw-woarm64-build/issues/9#issuecomment-2573385824 - c_unsigned_long_long: Explicitly use c_uint64_t instead of depending on c_unsigned_long - c_uintmax_t: Use 64-bit on Windows (consistent with MSVC/MinGW) Fixes issue reported in https://github.com/msys2/MINGW-packages/pull/16579 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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