Fixes #10941: Fix Glyphicons path for those importing bootstrap.less from another directory

dist/css/bootstrap.css

@@ -2680,7 +2680,7 @@ input[type="button"].btn-block {
 @font-face {
   font-family: 'Glyphicons Halflings';
   src: url('../fonts/glyphicons-halflings-regular.eot');
-  src: url('../fonts/glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), url('../fonts/glyphicons-halflings-regular.woff') format('woff'), url('../fonts/glyphicons-halflings-regular.ttf') format('truetype'), url('../fonts/glyphicons-halflings-regular.svg#glyphicons_halflingsregular') format('svg');
+  src: url('../fonts/glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'), url('../fonts/glyphicons-halflings-regular.woff') format('woff'), url('../fonts/glyphicons-halflings-regular.ttf') format('truetype'), url('../fonts/glyphicons-halflings-regular.svg#glyphicons-halflingsregular') format('svg');
 }
 
 .glyphicon {

less/glyphicons.less

@@ -10,11 +10,11 @@
 // Import the fonts
 @font-face {
   font-family: 'Glyphicons Halflings';
-  src: url('@{icon-font-path}@{icon-font-name}.eot');
-  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');
+  src: ~"url('@{icon-font-path}@{icon-font-name}.eot')";
+  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')";
 }
 
 // Catchall baseclass