Enable ARM desktop SDK macro in projects

Add _ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE=1 to PreprocessorDefinitions in multiple .vcxproj files so ARM desktop SDK partition is available at project level. Remove per-file #ifdef _M_ARM defines from several headers and source files (Stdafx.h, targetver.h, main.cpp across various modules) to avoid duplication. Also add ShowIncludes=false in pkgread.vcxproj. This centralizes the ARM macro for consistent ARM builds across modules.

IEHelper/IEHelper.vcxproj

@@ -133,7 +133,7 @@
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_DEBUG;%(PreprocessorDefinitions);_ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE=1</PreprocessorDefinitions>
       <PrecompiledHeader>Use</PrecompiledHeader>
     </ClCompile>
     <Link>
@@ -165,7 +165,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
-      <PreprocessorDefinitions>WIN32;NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;%(PreprocessorDefinitions);_ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE=1</PreprocessorDefinitions>
       <PrecompiledHeader>Use</PrecompiledHeader>
     </ClCompile>
     <Link>

IEHelper/Stdafx.h

@@ -4,10 +4,6 @@
 
 #pragma once
 
-#ifdef _M_ARM
-#define _ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE 1
-#endif
-
 #include <Windows.h>
 #include <atlbase.h>
 #include <ExDisp.h>