6806046: Hotspot build error when compiled from Visual Studio

Summary: Define HOTSPOT_LIB_ARCH in the preprocessor flags of the generated projects
Reviewed-by: kamg, xlu

src/share/tools/MakeDeps/BuildConfig.java

@@ -247,6 +247,7 @@ class BuildConfig {
         sysDefines.add("HOTSPOT_BUILD_USER="+System.getProperty("user.name"));
         sysDefines.add("HOTSPOT_BUILD_TARGET=\\\""+get("Build")+"\\\"");
         sysDefines.add("_JNI_IMPLEMENTATION_");
+        sysDefines.add("HOTSPOT_LIB_ARCH=\\\"i486\\\"");
 
         sysDefines.addAll(defines);