[PATCH] libgcc/aarch64: also provide AT_HWCAP2 fallback

[Jan Beulich]

Much like AT_HWCAP is already provided in case the platform headers
don't have the value (yet).

libgcc/

        * config/aarch64/cpuinfo.c: Provide AT_HWCAP2.
---
Observed as build failure with 14.1.0, so may want backporting there.

--- a/libgcc/config/aarch64/cpuinfo.c
+++ b/libgcc/config/aarch64/cpuinfo.c
@@ -146,6 +146,9 @@ struct {
 #define HWCAP_PACG (1UL << 31)
 #endif
 
+#ifndef AT_HWCAP2
+#define AT_HWCAP2 26
+#endif
 #ifndef HWCAP2_DCPODP
 #define HWCAP2_DCPODP (1 << 0)
 #endif