bsd-user/target_os_elf: If ELF_HWCAP2 is defined, publish it

Some architectures publish AT_HWCAP2 as well as AT_HWCAP. Those
architectures will define ELF_HWCAP2 in their target_arch_elf.h files
for the value for this process. If it is defined, then publish it.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>

bsd-user/freebsd/target_os_elf.h

@@ -112,6 +112,10 @@ static abi_ulong target_create_elf_tables(abi_ulong p, int argc, int envc,
         NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
         features = ELF_HWCAP;
         NEW_AUX_ENT(FREEBSD_AT_HWCAP, features);
+#ifdef ELF_HWCAP2
+        features = ELF_HWCAP2;
+        NEW_AUX_ENT(FREEBSD_AT_HWCAP2, features);
+#endif
         NEW_AUX_ENT(AT_UID, (abi_ulong)getuid());
         NEW_AUX_ENT(AT_EUID, (abi_ulong)geteuid());
         NEW_AUX_ENT(AT_GID, (abi_ulong)getgid());