Fix use of undeclared identifier `__cpuidex` error on MinGW #31865

Job	Run time
📊 Static checks / Code style, file formatting, and docs	29s
🐧 Linux / Editor w/ Mono (target=editor)	6m 6s
🐧 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)	37m 43s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	8m 20s
🍎 macOS / Editor (target=editor, tests=yes)	5m 24s
🍎 macOS / Template (target=template_release)	3m 22s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	7m 3s
🐧 Linux / Template w/ Mono (target=template_release)	2m 20s
🍏 iOS / Template (target=template_release)	2m 21s
🐧 Linux / Minimal template (target=template_release, everything disabled)	2m 30s
🤖 Android / Template (target=template_release)	5m 41s
🏁 Windows / Editor (target=editor, tests=yes)	8m 47s
🏁 Windows / Template (target=template_release)	7m 47s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	4m 20s
🌐 Web / Template w/o threads (target=template_release, threads=no)	4m 15s
🪲 Godot CPP / Build and test Godot CPP	7m 35s
	1h 54m 3s

Provide feedback