Increase ctest RunScript line coverage. (Note: NEW_PROCESS argument is currently causing the test to fail, still investigating the reason for this, will add coverage for it later)

Tests/CTestTestRunScript/test.cmake.in

@@ -1,2 +1,2 @@
 SET(CTEST_RUN_CURRENT_SCRIPT 0)
-CTEST_RUN_SCRIPT("CTestTestRunScript/hello.cmake")
+CTEST_RUN_SCRIPT("CTestTestRunScript/hello.cmake" RETURN_VALUE res RETURN_VALUE)