VS: Add the entry point when compiling for WindowsCE

Set the entry point to mainACRTStartup to make sure that main()
can be found when linking the application to check the compiler.

Modules/CMakeCCompilerId.c.in

@@ -228,7 +228,3 @@ int main(int argc, char* argv[])
   return require;
 }
 #endif
-
-#ifdef ADD_MAINCRTSTARTUP
-void mainCRTStartup() {}
-#endif

Modules/CMakeCXXCompilerId.cpp.in

@@ -210,7 +210,3 @@ int main(int argc, char* argv[])
   (void)argv;
   return require;
 }
-
-#ifdef ADD_MAINCRTSTARTUP
-extern "C" void mainCRTStartup() {}
-#endif

Modules/CMakeDetermineCompilerId.cmake

@@ -141,7 +141,7 @@ Id flags: ${testflags}
       set(id_toolset "")
     endif()
     if(CMAKE_VS_WINCE_VERSION)
-      set(id_definitions "ADD_MAINCRTSTARTUP")
+      set(id_entrypoint "mainACRTStartup")
       set(id_subsystem 9)
     else()
       set(id_subsystem 1)

Modules/CompilerId/VS-7.vcproj.in

@@ -24,7 +24,6 @@
 			<Tool
 				Name="VCCLCompilerTool"
 				Optimization="0"
-				PreprocessorDefinitions="@id_definitions@"
 				MinimalRebuild="false"
 				BasicRuntimeChecks="3"
 				RuntimeLibrary="3"
@@ -37,6 +36,7 @@
 				LinkIncremental="1"
 				GenerateDebugInformation="false"
 				SubSystem="@id_subsystem@"
+				EntryPointSymbol="@id_entrypoint@"
 			/>
 			<Tool
 				Name="VCPostBuildEventTool"