remove param that is not used in msvc 9

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@6629 d0543943-73ff-0310-b7d9-9358b9ac24b2

w32/modules.vsprops

@@ -13,7 +13,6 @@
 		PreprocessorDefinitions="WIN32;_WINDOWS;_USRDLL;MOD_EXPORTS"
 		WarningLevel="4"
 		WarnAsError="true"
-		Detect64BitPortabilityProblems="true"
 	/>
 	<Tool
 		Name="VCLinkerTool"