deps: Temporarily patch html5ever for duplicate attribute tracking

Point html5ever, markup5ever, xml5ever, web_atoms, and tendril to the
duplicate-attr-flag branch which adds had_duplicate_attributes to
ElementFlags. This will be rebased once servo/html5ever#695 lands.

Author: dyegoaurelio

Cargo.lock

@@ -308,6 +308,12 @@ codegen-units = 1
 # xml5ever = { path = "../html5ever/xml5ever" }
 # tendril = { path = "../html5ever/tendril" }
 
+html5ever = { git = "https://github.com/dyegoaurelio/html5ever", branch = "duplicate-attr-flag" }
+markup5ever = { git = "https://github.com/dyegoaurelio/html5ever", branch = "duplicate-attr-flag" }
+xml5ever = { git = "https://github.com/dyegoaurelio/html5ever", branch = "duplicate-attr-flag" }
+web_atoms = { git = "https://github.com/dyegoaurelio/html5ever", branch = "duplicate-attr-flag" }
+tendril = { git = "https://github.com/dyegoaurelio/html5ever", branch = "duplicate-attr-flag" }
+
 # For WebRender:
 #
 # webrender = { path = "../webrender/webrender" }