windows-build.txt: Update for system uthash

windows-build.txt

@@ -85,6 +85,14 @@ mingw-get install mingw32-pdcurses
 Ctrl-D or typing "logout" and pressing the enter key should get you out of the
 window.
 
+**************************************************************************************
+* Install UTHash/UTList                                                              *
+**************************************************************************************
+Go to the website http://troydhanson.github.io/uthash/
+Download uthash-master.zip and unzip anywhere
+Go to the directory uthash-master/src
+Copy all the files to c:/mingw/include
+
 **************************************************************************************
 * Install GTK-WIN, required for Pkg-config in the next step                          *
 **************************************************************************************