SCons: Use CXXFLAGS to disable exceptions, it's only for C++ #13949

Job	Run time
📊 Static checks / Code style, file formatting, and docs	46s
🍏 iOS / Template (target=template_release)	28m 12s
🍎 macOS / Editor (target=editor, tests=yes)	35m 19s
🍎 macOS / Template (target=template_release)	31m 23s
🌐 Web / Template (target=template_release)	36m 40s
🤖 Android / Template (target=template_release)	50m 10s
🐧 Linux / Editor w/ Mono (target=editor)	1h 12m 37s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	1h 12m 13s
🏁 Windows / Editor (target=editor, tests=yes)	14m 45s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	41m 24s
🏁 Windows / Template (target=template_release)	10m 39s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	57m 20s
🐧 Linux / Template w/ Mono (target=template_release)	32m 23s
🐧 Linux / Minimal template (target=template_release, everything disabled)	28m 24s
🪲 Godot CPP / Build and test Godot CPP	12m 2s
	8h 44m 17s

Provide feedback