Delete Visual Studio build files

source/samples/cal/cal.vcxproj.filters

Index: source/samples/cal/cal.vcxproj.filters
diff --git a/source/samples/cal/cal.vcxproj.filters b/source/samples/cal/cal.vcxproj.filters
deleted file mode 100644
index 1d14d63b2ca03aeb567fa2fe300b5db802922708..0000000000000000000000000000000000000000
--- a/source/samples/cal/cal.vcxproj.filters
+++ /dev/null
@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <ItemGroup>
-    <Filter Include="Source Files">
-      <UniqueIdentifier>{3e036a59-b898-49e5-9d06-4878387b4a02}</UniqueIdentifier>
-      <Extensions>cpp;c;cxx;rc;def;r;odl;idl;hpj;bat</Extensions>
-    </Filter>
-    <Filter Include="Header Files">
-      <UniqueIdentifier>{ace55cd2-56c0-4c6d-965b-8866c5396b04}</UniqueIdentifier>
-      <Extensions>h;hpp;hxx;hm;inl</Extensions>
-    </Filter>
-    <Filter Include="Resource Files">
-      <UniqueIdentifier>{823558d3-c303-4670-9e92-d8f5c02e39e2}</UniqueIdentifier>
-      <Extensions>ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe</Extensions>
-    </Filter>
-  </ItemGroup>
-  <ItemGroup>
-    <ClCompile Include="cal.c">
-      <Filter>Source Files</Filter>
-    </ClCompile>
-    <ClCompile Include="uprint.c">
-      <Filter>Source Files</Filter>
-    </ClCompile>
-  </ItemGroup>
-  <ItemGroup>
-    <ClInclude Include="uprint.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
-  </ItemGroup>
-</Project>