added link to pow

Author: Ruggero-R

Diff for: loader/llext_exports.c

@@ -181,6 +181,7 @@ EXPORT_SYMBOL(sin);
 EXPORT_SYMBOL(cos);
 EXPORT_SYMBOL(tan);
 EXPORT_SYMBOL(atan);
+EXPORT_SYMBOL(pow);
 
 EXPORT_SYMBOL(puts);
 EXPORT_SYMBOL(putchar);