Generate git_branch.h and git_hash.h for Windows/MSVC builds.

src/sbbs3/gitinfo.bat

+@git log -1 HEAD --format="#define GIT_HASH \"%%h\"" > git_hash.h
+@echo #define GIT_BRANCH ^"| tr -d "\r\n" > git_branch.h
+@git rev-parse --abbrev-ref HEAD | tr -d "\n" >> git_branch.h
+@echo ^" >> git_branch.h
\ No newline at end of file

src/sbbs3/sbbs.vcxproj

@@ -114,6 +114,9 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <OutputFile>.\msvc.win32.dll.debug/sbbs.bsc</OutputFile>
     </Bscmake>
+    <PreBuildEvent>
+      <Command>gitinfo.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <Midl>
@@ -163,6 +166,9 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <OutputFile>.\msvc.win32.dll.release/sbbs.bsc</OutputFile>
     </Bscmake>
+    <PreBuildEvent>
+      <Command>gitinfo.bat</Command>
+    </PreBuildEvent>
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\comio\comio.c" />