Tests: Honor CMake_TEST_NO_NETWORK in RunCMake.file-DOWNLOAD

Most of the test uses `file://` URLs instead of hitting the network.
However, a case covering an invalid hostname does try to make a real
connection, expecting it to fail DNS resolution.  Turn off that case
if we are asked not to hit the network during testing.

Tests/RunCMake/CMakeLists.txt

@@ -466,7 +466,7 @@ add_RunCMake_test(ctest_fixtures)
 add_RunCMake_test(define_property)
 add_RunCMake_test(file -DCYGWIN=${CYGWIN} -DMSYS=${MSYS})
 add_RunCMake_test(file-CHMOD -DMSYS=${MSYS})
-add_RunCMake_test(file-DOWNLOAD)
+add_RunCMake_test(file-DOWNLOAD -DCMake_TEST_NO_NETWORK=${CMake_TEST_NO_NETWORK})
 add_RunCMake_test(file-RPATH -DCMAKE_SYSTEM_NAME=${CMAKE_SYSTEM_NAME})
 add_RunCMake_test(find_file)
 add_RunCMake_test(find_library -DCYGWIN=${CYGWIN} -DMSYS=${MSYS})

Tests/RunCMake/file-DOWNLOAD/RunCMakeTest.cmake

@@ -14,10 +14,13 @@ run_cmake(tls-verify-not-set)
 run_cmake(pass-not-set)
 run_cmake(no-save-hash)
 
-run_cmake(bad-hostname)
 run_cmake(basic)
 run_cmake(EXPECTED_HASH)
 run_cmake(file-without-path)
 run_cmake(no-file)
 run_cmake(range)
 run_cmake(SHOW_PROGRESS)
+
+if(NOT CMake_TEST_NO_NETWORK)
+  run_cmake(bad-hostname)
+endif()