[TYPO3] Add ext:realurls's autoconfig file

If you are using the common used ext:realurl without a custom extConf
the auto generated config file shouldn’t be added to scm.

Typo3.gitignore

@@ -9,6 +9,7 @@
 /typo3conf/temp_fieldInfo.php
 /typo3conf/deprecation_*.log
 /typo3conf/ENABLE_INSTALL_TOOL
+/typo3conf/realurl_autoconf.php
 /FIRST_INSTALL
 # Ignore system folders, you should have them symlinked.
 # If not comment out the following entries.