Add contrib/vstudio/vc10 pre-build step for static only.

Also correct typo for 64-bit debug build.

contrib/vstudio/vc10/zlibstat.vcxproj

@@ -182,6 +182,10 @@
       <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
       <SuppressStartupBanner>true</SuppressStartupBanner>
     </Lib>
+    <PreBuildEvent>
+      <Command>cd ..\..\masmx86
+bld_ml32.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
@@ -210,6 +214,10 @@
       <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
       <SuppressStartupBanner>true</SuppressStartupBanner>
     </Lib>
+    <PreBuildEvent>
+      <Command>cd ..\..\masmx86
+bld_ml32.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">
     <ClCompile>
@@ -266,6 +274,10 @@
       <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
       <SuppressStartupBanner>true</SuppressStartupBanner>
     </Lib>
+    <PreBuildEvent>
+      <Command>cd ..\..\masmx64
+bld_ml64.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">
     <Midl>
@@ -326,6 +338,10 @@
       <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
       <SuppressStartupBanner>true</SuppressStartupBanner>
     </Lib>
+    <PreBuildEvent>
+      <Command>cd ..\..\masmx64
+bld_ml64.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
     <Midl>

contrib/vstudio/vc10/zlibvc.vcxproj

@@ -383,7 +383,7 @@ bld_ml32.bat</Command>
       <TargetMachine>MachineX64</TargetMachine>
     </Link>
     <PreBuildEvent>
-      <Command>cd ..\..\contrib\masmx64
+      <Command>cd ..\..\masmx64
 bld_ml64.bat</Command>
     </PreBuildEvent>
   </ItemDefinitionGroup>