Original issue title: Custom build in 1.11 branch produces file which gives 'Sizzle is undefined' JS error

Hi there!

I need smallest build to debug some issue in IE8. Next command is used for cooking that build

vv@vv-Latitude-E5520 ~/work/own/uos/lss/src/html_report/javascript/jquery $ grunt custom:-ajax,-deprecated,-dimensions,-effects,-event/alias,-offset,-deferred,-wrap,-exports/amd,-core/ready,-event,-css,-sizzle

after that

vv@vv-Latitude-E5520 ~/work/own/uos/lss/src/html_report/javascript/jquery $ ack -i sizzle dist/jquery.js 
 * jQuery JavaScript Library v1.11.3-pre -ajax,-ajax/jsonp,-ajax/load,-ajax/parseJSON,-ajax/parseXML,-ajax/script,-ajax/var/nonce,-ajax/var/rquery,-ajax/xhr,-manipulation/_evalUrl,-event/ajax,-deprecated,-dimensions,-effects,-effects/Tween,-effects/animatedSelector,-effects/support,-event/alias,-offset,-deferred,-wrap,-exports/amd,-core/ready,-event,-event/support,-css,-css/addGetHookIf,-css/curCSS,-css/defaultDisplay,-css/hiddenVisibleSelectors,-css/support,-css/swap,-css/var/cssExpand,-css/var/isHidden,-css/var/rmargin,-css/var/rnumnonpx,-sizzle
 * Includes Sizzle.js
 * http://sizzlejs.com/
    version = "1.11.3-pre -ajax,-ajax/jsonp,-ajax/load,-ajax/parseJSON,-ajax/parseXML,-ajax/script,-ajax/var/nonce,-ajax/var/rquery,-ajax/xhr,-manipulation/_evalUrl,-event/ajax,-deprecated,-dimensions,-effects,-effects/Tween,-effects/animatedSelector,-effects/support,-event/alias,-offset,-deferred,-wrap,-exports/amd,-core/ready,-event,-event/support,-css,-css/addGetHookIf,-css/curCSS,-css/defaultDisplay,-css/hiddenVisibleSelectors,-css/support,-css/swap,-css/var/cssExpand,-css/var/isHidden,-css/var/rmargin,-css/var/rnumnonpx,-sizzle",
jQuery.find = Sizzle;
jQuery.expr = Sizzle.selectors;
jQuery.unique = Sizzle.uniqueSort;
jQuery.text = Sizzle.getText;
jQuery.isXMLDoc = Sizzle.isXML;
jQuery.contains = Sizzle.contains;
                    // Don't pass non-elements to Sizzle
            // We eschew Sizzle here for performance reasons: http://jsperf.com/getall-vs-sizzle/2
vv@vv-Latitude-E5520 ~/work/own/uos/lss/src/html_report/javascript/jquery $ 

and here is error

just for the record: 2.1.3 is not affected

vv@vv-Latitude-E5520 ~/work/own/uos/lss/src/html_report/javascript/jquery $ ack -i sizzle dist/jquery.js 
 * Includes Sizzle.js
 * http://sizzlejs.com/
 * Optional (non-Sizzle) selector module for custom builds.
 * custom selectors via Sizzle extensions
 * If any of these are unacceptable tradeoffs, either use Sizzle or
        // Same basic safeguard as Sizzle
                    // Don't pass non-elements to Sizzle
            // We eschew Sizzle here for performance reasons: http://jsperf.com/getall-vs-sizzle/2
vv@vv-Latitude-E5520 ~/work/own/uos/lss/src/html_report/javascript/jquery $