Issue #1599774 by longwave, ben.bunk, Rob C, stefan.r, David_Rothstein,...

Issue #1599774 by longwave, ben.bunk, Rob C, stefan.r, David_Rothstein, BTMash, kristofferwiklund, marcingy, mpdonadio, DuneBL, serundeputy, Letharion, quicksketch, alexpott, J-Lee, Morbus Iff: Drupal fails to boot with 503 error and .htaccess protections do not work on Apache 2.4 without mod_access_compat