Remove empty Cat-Structs tests from csdb/tests

Also remove related section from README

Author: delphidabbler

csdb/tests/Cat-Structs/TestStructsCat.dpr

@@ -24,9 +24,6 @@
 			<Projects Include="Cat-Arrays\TestArraysCat.dproj">
 				<Dependencies/>
 			</Projects>
-			<Projects Include="Cat-Structs\TestStructsCat.dproj">
-				<Dependencies/>
-			</Projects>
 		</ItemGroup>
 		<ProjectExtensions>
 			<Borland.Personality>Default.Personality.12</Borland.Personality>

csdb/tests/Cat-Structs/TestStructsCat.dproj

@@ -36,10 +36,6 @@ The project has the following directories:
 
   Contains the _TestCatString_ project that provides _DUnit_ tests for selected snippets from the database's _String Management_ category.
 
-### `./Src/Cat-Structs`
-
-  Contains the _TestCatStruct_ project the provides _DUnit_ tests for selected snippets from the database's _Structs_ category.
-
 ### `./Src/Cat-WinSys`
 
   Contains the _TextWinSysCat_ project that provides a GUI application that exercises and demonstrates all the code from the database's _Windows System_ category.