Give better error messages for users when trying to run the 64 bit editor on a 32 bit JVM

editor/build/build.py

Index: editor/build/build.py
===================================================================
--- editor/build/build.py	(revision 28043)
+++ editor/build/build.py	(working copy)
@@ -914,6 +914,8 @@
   f.close()
   lines[lines.index('-Xms40m\n')] = '-Xms256m\n'
   lines[lines.index('-Xmx1000m\n')] = '-Xmx2000m\n'
+  # Add -d64 to give better error messages to user in 64 bit mode.
+  lines[lines.index('-vmargs\n')] = '-vmargs\n-d64\n'
   f = open(iniFilePath, 'w')
   f.writelines(lines);
   f.close()