ProcessorCount test: fix path to cmsysTestsCxx executable

Use a generator expression to get the real place of this target instead of
guessing it wrong.

Tests/CMakeTests/CMakeLists.txt

@@ -4,7 +4,8 @@ set(CMAKE_EXECUTABLE "${CMake_BIN_DIR}/cmake")
 macro(AddCMakeTest TestName PreArgs)
   configure_file("${CMAKE_CURRENT_SOURCE_DIR}/${TestName}Test.cmake.in"
     "${CMAKE_CURRENT_BINARY_DIR}/${TestName}Test.cmake" @ONLY IMMEDIATE)
-  add_test(CMake.${TestName} ${CMAKE_EXECUTABLE} ${PreArgs}
+  add_test(NAME CMake.${TestName}
+    COMMAND ${CMAKE_EXECUTABLE} ${PreArgs}
     -P "${CMAKE_CURRENT_BINARY_DIR}/${TestName}Test.cmake" ${ARGN})
 endmacro()
 
@@ -28,7 +29,7 @@ AddCMakeTest(String "")
 AddCMakeTest(Math "")
 AddCMakeTest(CMakeMinimumRequired "")
 AddCMakeTest(CompilerIdVendor "")
-AddCMakeTest(ProcessorCount "")
+AddCMakeTest(ProcessorCount "-DKWSYS_TEST_EXE=$<TARGET_FILE:cmsysTestsCxx>")
 AddCMakeTest(PushCheckState "")
 AddCMakeTest(While "")
 

Tests/CMakeTests/ProcessorCountTest.cmake.in

@@ -9,7 +9,7 @@ message("### 3. ProcessorCount(...) function call is emitting output that it sho
 message("processor_count='${processor_count}'")
 
 execute_process(
-  COMMAND "@CMAKE_BINARY_DIR@/Source/kwsys/$ENV{CMAKE_CONFIG_TYPE}/cmsysTestsCxx"
+  COMMAND "${KWSYS_TEST_EXE}"
   testSystemInformation
   OUTPUT_VARIABLE tsi_out
   ERROR_VARIABLE tsi_err)