remove workaround for older gdbs that didn't have lookup_static_symbol

pwndbg/gdblib/symbol.py

@@ -161,14 +161,7 @@ def static_linkage_symbol_address(symbol: str) -> int:
     """
 
     try:
-        if hasattr(gdb, "lookup_static_symbol"):
-            symbol_obj = gdb.lookup_static_symbol(symbol)
-        else:
-            # GDB < 9.x does not have `gdb.lookup_static_symbol`
-            # We will fallback to `gdb.lookup_symbol` here, but the drawback is that we might find incorrect symbol if there is a symbol with the same name which is not static linkage
-            # But this is better than just returning None
-            # TODO/FIXME: Find a way to get the static linkage symbol's address in GDB < 9.x
-            symbol_obj = gdb.lookup_symbol(symbol)[0]
+        symbol_obj = gdb.lookup_static_symbol(symbol)
         return int(symbol_obj.value().address) if symbol_obj else None
     except gdb.error:
         return None