Update CXXFLAGS in SYCL CIs (#389) #960

Job	Run time
🔄 Update Stub Files / Stubs	4m 5s
🐧 Ubuntu / [email protected] w/ libc++ w/ MPI	2m 37s
🐧 Ubuntu / [email protected] Debug	8m 38s
🐧 Ubuntu / [email protected] w/o MPI	2m 7s
🐧 Ubuntu / [email protected]	4m 54s
🐧 Ubuntu / [email protected] [email protected]	2m 32s
🪟 Windows / MSVC w/o MPI Static Release	1h 22m 30s
🪟 Windows / Clang w/o MPI Shared Debug	27m 18s
🐧 Intel / ICC	10m 35s
🐧 Intel / ICPX	24m 17s
🐧 Intel / oneAPI SYCL 3D	29m 42s
🍏 macOS / [email protected] w/o MPI	4m 13s
🔎 CodeQL / Analyze (python)	3m 54s
🐧 HIP / ROCm HIP 6.1	8m 43s
🔎 CodeQL / Analyze (cpp)	19m 17s
	3h 55m 22s

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