Run gitinfo.bat in prebuild event

To (re)generate git_branch.h and git_hash.h every build

src/vdmodem/vdmodem.vcxproj

@@ -106,6 +106,9 @@
       <SubSystem>Console</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
+    <PreBuildEvent>
+      <Command>..\build\gitinfo.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
@@ -123,6 +126,9 @@
       <OptimizeReferences>true</OptimizeReferences>
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
+    <PreBuildEvent>
+      <Command>..\build\gitinfo.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <ClCompile>
@@ -136,6 +142,9 @@
       <SubSystem>Console</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
+    <PreBuildEvent>
+      <Command>..\build\gitinfo.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
@@ -153,6 +162,9 @@
       <OptimizeReferences>true</OptimizeReferences>
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
+    <PreBuildEvent>
+      <Command>..\build\gitinfo.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\sbbs3\telnet.c" />