Avoid using __builtin_cpu_supports

[cataphract]

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[datadog-prod-us1-3]

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 84.57% (+0.00%)

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[Copilot]

Pull request overview

This PR removes reliance on __builtin_cpu_supports for SSE4.1 detection in the glibc-compat ceilf implementation on __x86_64__, replacing it with a local cpuid-based runtime check to avoid problematic relocations / missing symbols in some toolchain + Rust linking scenarios.

Changes:

• Add a local cpu_supports_sse41() helper that checks SSE4.1 support via cpuid.
• Switch the ceilf runtime dispatch to use cpu_supports_sse41() instead of __builtin_cpu_init() / __builtin_cpu_supports("sse4.1").

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Dynamic Artifact Size Comparison 📦

Artifact	Previous Release	This PR	Difference
darwin-arm64::libddwaf.dylib	2020272	2020272	0.00%
darwin-universal::libddwaf.dylib	4232112	4232112	0.00%
darwin-x86_64::libddwaf.dylib	2207728	2207728	0.00%
linux-aarch64::libddwaf.so	2387392	2387392	0.00%
linux-armv7::libddwaf.so	2056572	2056572	0.00%
linux-i386::libddwaf.so	2308204	2308204	0.00%
linux-x86_64::libddwaf.so	2581096	2576520	-0.17%
windows-arm64::ddwaf.dll	6726144	6726144	0.00%
windows-win32::ddwaf.dll	3328000	3328000	0.00%
windows-x64::ddwaf.dll	4066816	4066816	0.00%

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Static Artifact Size Comparison 📦

Artifact	Previous Release	This PR	Difference
darwin-arm64::libddwaf.a	92555960	92555960	0.00%
darwin-arm64::libddwaf.a.stripped	4717512	4717512	0.00%
darwin-universal::libddwaf.a	186638424	186638424	0.00%
darwin-universal::libddwaf.a.stripped	10047056	10047056	0.00%
darwin-x86_64::libddwaf.a	94082416	94082416	0.00%
darwin-x86_64::libddwaf.a.stripped	5329496	5329496	0.00%
linux-aarch64::libddwaf.a	75526438	75526438	0.00%
linux-aarch64::libddwaf.a.stripped	12185562	12185562	0.00%
linux-armv7::libddwaf.a	66734102	66734106	0.00%
linux-armv7::libddwaf.a.stripped	11193482	11193482	0.00%
linux-i386::libddwaf.a	64921342	64921346	0.00%
linux-i386::libddwaf.a.stripped	9680046	9680046	0.00%
linux-x86_64::libddwaf.a	76013242	76013338	0.00%
linux-x86_64::libddwaf.a.stripped	11989382	11989262	0.00%
windows-arm64::ddwaf.lib	16902	16902	0.00%
windows-arm64::ddwaf_static.lib	134713692	134713692	0.00%
windows-win32::ddwaf.lib	17228	17228	0.00%
windows-win32::ddwaf_static.lib	47488650	47488650	0.00%
windows-x64::ddwaf.lib	16902	16902	0.00%
windows-x64::ddwaf_static.lib	55265732	55265732	0.00%