Summary

The RADE/Opus integration assumed a POSIX build environment (autotools, <sys/types.h>, libm). This PR adds full Windows build support so AetherSDR can be compiled with MinGW or MSVC toolchains while retaining the existing Linux/macOS build path.

Changes

CMakeLists.txt

• Use /w (MSVC) or -w (GCC/MinGW) for RADE source warning suppression — the previous hardcoded -w flag is not valid for MSVC
• Add IS_BUILDING_RADE_API=1 to the main target's compile definitions (was only set on the RADE sources, causing missing symbol errors when the main target includes RADE headers)
• Conditionally link libm only on non-Windows — MSVC provides math functions in the CRT; linking -lm on MSVC produces linker errors

third_party/radae/cmake/BuildOpus.cmake

• Add a Windows-specific ExternalProject path that builds Opus via its native CMake build system instead of autotools. The autotools path (./configure && make) requires MSYS2/Cygwin on Windows and fails under MinGW-w64
• Handles both MSVC (opus.lib) and MinGW (libopus.a) library naming conventions
• Enables OPUS_DRED and OPUS_OSCE for the neural codec features used by RADE

third_party/radae/cmake/PatchOpusNnet.cmake (new file)

• Pure-CMake replacement for the Unix patch command used by the autotools build to apply RADE_EXPORT attributes to Opus dnn/nnet.h
• Downloads and extracts the Opus neural network model data (fargan_data.h, plc_data.h, lace_data.h etc.) with a fallback mirror URL — the autotools build does this via autogen.sh, which doesn't run under the CMake path
• Works on all platforms without requiring patch(1)

third_party/radae/src/kiss_fft.h / rade_api.h

• Replace #include <sys/types.h> with #include <stddef.h> on Windows — sys/types.h is a POSIX header not available in the MSVC standard library. stddef.h provides the needed size_t type portably.

Test Plan

• Build on Windows with MinGW-w64 (GCC 14+) — verify RADE/Opus compiles and links
• Build on Windows with MSVC (Visual Studio 2022) — verify /w flag and opus.lib naming
• Build on Linux (existing CI) — verify no regression in autotools Opus path
• Build on macOS — verify no regression in universal binary path
• Run AetherSDR on Windows — verify RADE digital voice encode/decode works
• Verify Opus neural network model data downloads and extracts correctly on first build

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