src/sage/doctest/sources.py: disable bitness tag processing

These have been excised from the sage library.

Author: orlitzky

src/sage/doctest/sources.py

@@ -58,8 +58,6 @@
 code_block = re.compile(r"^(\s*)[.][.]\s*code-block\s*::.*$")
 
 whitespace = re.compile(r"\s*")
-bitness_marker = re.compile('#.*(32|64)-bit')
-bitness_value = '64' if sys.maxsize > (1 << 32) else '32'  # cf. sage.features.bitness
 
 # For neutralizing doctests
 find_prompt = re.compile(r"^(\s*)(>>>|sage:)(.*)")
@@ -336,13 +334,6 @@ def _create_doctests(self, namespace, tab_okay=None) -> tuple[list[doctest.DocTe
                     self._process_doc(doctests, doc, namespace, start)
                     unparsed_doc = False
                 else:
-                    bitness = bitness_marker.search(line)
-                    if bitness:
-                        if bitness.groups()[0] != bitness_value:
-                            self.line_shift += 1
-                            continue
-                        else:
-                            line = line[:bitness.start()] + "\n"
                     if self.line_shift and (m := sagestart.match(line)):
                         # We insert empty doctest lines to make up for the removed lines
                         indent_and_prompt = m.group(1)