Merge pull request #12164 from thomaswelton/issue-12162

Fix value of svg font ID & removed hard coding

less/glyphicons.less

@@ -14,7 +14,7 @@
   src: ~"url('@{icon-font-path}@{icon-font-name}.eot?#iefix') format('embedded-opentype')",
        ~"url('@{icon-font-path}@{icon-font-name}.woff') format('woff')",
        ~"url('@{icon-font-path}@{icon-font-name}.ttf') format('truetype')",
-       ~"url('@{icon-font-path}@{icon-font-name}.svg#glyphicons-halflingsregular') format('svg')";
+       ~"url('@{icon-font-path}@{icon-font-name}.svg#@{icon-font-svg-id}') format('svg')";
 }
 
 // Catchall baseclass

less/variables.less

@@ -74,7 +74,7 @@
 
 @icon-font-path:          "../fonts/";
 @icon-font-name:          "glyphicons-halflings-regular";
-
+@icon-font-svg-id:				"glyphicons_halflingsregular";
 
 //== Components
 //