Make the build less hostile to MSVC (needed for the viewer port) and
align the CUDA standard with C++.
- Remove the CMAKE_C/CXX_FLAGS_RELEASE overrides: -O3/-DNDEBUG only
duplicate CMake's own GCC/Clang Release defaults, and the SET()
clobbered the MSVC defaults. The lone meaningful flag,
-Wno-deprecated-enum-enum-conversion, merely silenced warnings from
the vendored Xilinx ap_private.h in the FPGA path; with no -Werror
it is just log noise, so drop it.
- CMAKE_CUDA_STANDARD 17 -> 20 (+ STANDARD_REQUIRED); CUDA >= 12.8
already supports C++20.
- Drop the file-scoped -Ofast on JFPedestalCalc.cpp /
JFConversionFloatingPoint.cpp: it is GCC-only and reaches the MSVC
viewer via JFJochCommon -> JFCalibration. Those files now build at
plain -O3.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>