remove String#absolute_path? monkey patch

lib/rscons.rb

@@ -37,4 +37,10 @@ module Rscons
     end
     Cache.clear
   end
+
+  # Return whether the given path is an absolute filesystem path or not
+  # @param path [String] the path to examine
+  def self.absolute_path?(path)
+    path =~ %r{^(/|\w:[\\/])}
+  end
 end

lib/rscons/environment.rb

@@ -111,7 +111,7 @@ module Rscons
         end
       end
       if @build_root and not found_match
-        unless source_fname.absolute_path? or build_fname.start_with?("#{@build_root}/")
+        unless Rscons.absolute_path?(source_fname) or build_fname.start_with?("#{@build_root}/")
           build_fname = "#{@build_root}/#{build_fname}"
         end
       end

lib/rscons/monkey/string.rb

@@ -6,9 +6,4 @@ class String
   def set_suffix(suffix = '')
     sub(/\.[^.]*$/, suffix)
   end
-
-  # Return whether the string represents an absolute filesystem path
-  def absolute_path?
-    self =~ %r{^(/|\w:[\\/])}
-  end
 end