cmCTest, cmCTestCoverageHandler: remove cwd dance

The working directory changes here didn't really accomplish anything.

Source/CTest/cmCTestCoverageHandler.cxx

@@ -1646,11 +1646,7 @@ int cmCTestCoverageHandler::HandleTracePyCoverage(
 
   std::string testingDir = this->CTest->GetBinaryDir() + "/Testing";
   std::string tempDir = testingDir + "/CoverageInfo";
-  std::string currentDirectory = cmSystemTools::GetCurrentWorkingDirectory();
   cmSystemTools::MakeDirectory(tempDir.c_str());
-  cmSystemTools::ChangeDirectory(tempDir);
-
-  cmSystemTools::ChangeDirectory(currentDirectory);
 
   std::vector<std::string>::iterator fileIt;
   int file_count = 0;
@@ -1737,7 +1733,6 @@ int cmCTestCoverageHandler::HandleTracePyCoverage(
     }
     ++file_count;
   }
-  cmSystemTools::ChangeDirectory(currentDirectory);
   return file_count;
 }
 

Source/cmCTest.cxx

@@ -1122,7 +1122,6 @@ int cmCTest::RunTest(std::vector<const char*> argv, std::string* output,
     if (log) {
       *log << "* Run internal CTest" << std::endl;
     }
-    std::string oldpath = cmSystemTools::GetCurrentWorkingDirectory();
 
     CM_AUTO_PTR<cmSystemTools::SaveRestoreEnvironment> saveEnv;
     if (modifyEnv) {
@@ -1137,7 +1136,6 @@ int cmCTest::RunTest(std::vector<const char*> argv, std::string* output,
     if (log && output) {
       *log << *output;
     }
-    cmSystemTools::ChangeDirectory(oldpath);
     if (output) {
       cmCTestLog(this, HANDLER_VERBOSE_OUTPUT,
                  "Internal cmCTest object used to run test." << std::endl