Classify builds, pkgproj, resx and sfproj as XML (#2954)

* Classify builds, pkgproj, resx and sfproj as XML

* Disambiguate .builds for XML and Text

lib/linguist/heuristics.rb

@@ -86,6 +86,14 @@ module Linguist
       end
     end
 
+    disambiguate ".builds" do |data|
+      if /^(\s*)(<Project|<Import|<Property|<?xml|xmlns)/i.match(data)
+        Language["XML"]
+      else
+        Language["Text"]
+      end
+    end
+
     disambiguate ".ch" do |data|
       if /^\s*#\s*(if|ifdef|ifndef|define|command|xcommand|translate|xtranslate|include|pragma|undef)\b/i.match(data)
         Language["xBase"]

lib/linguist/languages.yml

@@ -3859,6 +3859,7 @@ XML:
   - .xml
   - .ant
   - .axml
+  - .builds
   - .ccxml
   - .clixml
   - .cproject
@@ -3890,6 +3891,7 @@ XML:
   - .nuspec
   - .odd
   - .osm
+  - .pkgproj
   - .plist
   - .pluginspec
   - .props
@@ -3897,8 +3899,10 @@ XML:
   - .psc1
   - .pt
   - .rdf
+  - .resx
   - .rss
   - .scxml
+  - .sfproj
   - .srdf
   - .storyboard
   - .stTheme