4398 dont install cppunit (#4399)

* chore(SingleSocketPoller): spelling

* fix(CppUnit): do not install #4398

* fix(DataTest): do not install #4398

CppUnit/CMakeLists.txt

@@ -38,6 +38,3 @@ elseif(MINGW)
 		PUBLIC
 			_DLL)
 endif()
-
-POCO_INSTALL(CppUnit)
-POCO_GENERATE_PACKAGE(CppUnit)

Data/testsuite/DataTest/CMakeLists.txt

@@ -29,6 +29,3 @@ target_include_directories(DataTest
 		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
 		$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
-
-POCO_INSTALL(DataTest)
-POCO_GENERATE_PACKAGE(DataTest)

Net/include/Poco/Net/SingleSocketPoller.h

@@ -86,7 +86,7 @@ public:
 	}
 
 	bool done() const
-		/// Returns tru if handler is done.
+		/// Returns true if handler is done.
 	{
 		return _reader.handlerDone();
 	}