remove .vcxproj.user file in tree

src/mod/say/mod_say_fa/mod_say_fa.2010.vcxproj.user

-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-</Project>
\ No newline at end of file