Revert "Fixed #22401 -- Deprecated regular expression parsing of initial SQL in favor of installing sqlparse."

This reverts commit 071c933775.

This introduced a regression on MySQL and custom SQL is deprecated.

docs/internals/contributing/writing-code/unit-tests.txt

@@ -166,7 +166,6 @@ dependencies:
 *  memcached_, plus a :ref:`supported Python binding <memcached>`
 *  gettext_ (:ref:`gettext_on_windows`)
 *  selenium_
-*  sqlparse_
 
 You can find these dependencies in `pip requirements files`_ inside the
 ``tests/requirements`` directory of the Django source tree and install them
@@ -198,7 +197,6 @@ associated tests will be skipped.
 .. _memcached: http://memcached.org/
 .. _gettext: http://www.gnu.org/software/gettext/manual/gettext.html
 .. _selenium: https://pypi.python.org/pypi/selenium
-.. _sqlparse: https://pypi.python.org/pypi/sqlparse
 .. _pip requirements files: http://www.pip-installer.org/en/latest/cookbook.html#requirements-files
 
 Code coverage

docs/internals/deprecation.txt

@@ -25,9 +25,6 @@ about each item can often be found in the release notes of two versions prior.
 * Using an incorrect count of unpacked values in the ``for`` template tag
   will raise an exception rather than fail silently.
 
-* The regular expression parsing of SQL initial data will be removed and
-  ``sqlparse`` will be required for the feature.
-
 .. _deprecation-removed-in-1.9:
 
 1.9