native: Don't use __xstat on loongarch64

We currently define __xstat to allow linking against older glibc builds.

glibc on loongarch64 does not have __xstat (not necessary), which
currently breaks our native library.

Detect the loongarch architecture and skip our xstat workaround.

Also see https://lists.openembedded.org/g/openembedded-core/topic/99216091

junixsocket-native/src/main/c/config.h

@@ -367,20 +367,24 @@ int jux_mangleErrno(int);
 #  else
 // This allows us to link against older glibc versions
 #    define memcpy memmove
-#    ifndef _STAT_VER
+#    if defined(__loongarch64)
+// no stat/__xstat workaround on loongarch64
+#    else
+#      ifndef _STAT_VER
 #        if defined(__aarch64__) || defined(__riscv)
 #            define _STAT_VER 0
 #        elif defined(__x86_64__)
 #            define _STAT_VER 1
 #        else
 #            define _STAT_VER 3
 #        endif
-#    endif
-#    if !defined(__xstat)
+#      endif
+#      if !defined(__xstat)
 extern int __xstat (int __ver, const char *__filename,
                     struct stat *__stat_buf) __THROW __nonnull ((2, 3));
+#      endif
+#      define stat(...) __xstat(_STAT_VER, __VA_ARGS__)
 #    endif
-#    define stat(...) __xstat(_STAT_VER, __VA_ARGS__)
 #  endif
 #endif