Fix runtime detection of SVE

It should obviously happen even if we don't compile for SVE. That's the
goal of runtime detection :-/

Thanks a lot to @AntoinePrv for spotting this.

Author: serge-sans-paille

include/xsimd/config/xsimd_cpuid.hpp

@@ -105,19 +105,15 @@ namespace xsimd
                 neon64 = 1;
 #if defined(__linux__) && (!defined(__ANDROID_API__) || __ANDROID_API__ >= 18)
                 i8mm_neon64 = bool(getauxval(AT_HWCAP2) & HWCAP2_I8MM);
+                sve = bool(getauxval(AT_HWCAP) & HWCAP_SVE);
 #endif
+
 #elif defined(__ARM_NEON) || defined(_M_ARM)
 
 #if defined(__linux__) && (!defined(__ANDROID_API__) || __ANDROID_API__ >= 18)
                 neon = bool(getauxval(AT_HWCAP) & HWCAP_NEON);
 #endif
 
-#elif defined(__ARM_FEATURE_SVE) && defined(__ARM_FEATURE_SVE_BITS) && __ARM_FEATURE_SVE_BITS > 0
-
-#if defined(__linux__) && (!defined(__ANDROID_API__) || __ANDROID_API__ >= 18)
-                sve = bool(getauxval(AT_HWCAP) & HWCAP_SVE);
-#endif
-
 #elif defined(__riscv_vector) && defined(__riscv_v_fixed_vlen) && __riscv_v_fixed_vlen > 0
 
 #if defined(__linux__) && (!defined(__ANDROID_API__) || __ANDROID_API__ >= 18)