tests: Don't run torture_keyfiles on Windows.

This test needs ssh-keygen to be working.

tests/unittests/CMakeLists.txt

@@ -3,10 +3,12 @@ project(unittests C)
 add_cmockery_test(torture_buffer torture_buffer.c ${TORTURE_LIBRARY})
 add_cmockery_test(torture_callbacks torture_callbacks.c ${TORTURE_LIBRARY})
 add_cmockery_test(torture_init torture_init.c ${TORTURE_LIBRARY})
-add_cmockery_test(torture_keyfiles torture_keyfiles.c ${TORTURE_LIBRARY})
 add_cmockery_test(torture_list torture_list.c ${TORTURE_LIBRARY})
 add_cmockery_test(torture_misc torture_misc.c ${TORTURE_LIBRARY})
 add_cmockery_test(torture_options torture_options.c ${TORTURE_LIBRARY})
 if (UNIX AND NOT WIN32)
+    # requires ssh-keygen
+    add_cmockery_test(torture_keyfiles torture_keyfiles.c ${TORTURE_LIBRARY})
+    # requires pthread
     add_cmockery_test(torture_rand torture_rand.c ${TORTURE_LIBRARY})
 endif (UNIX AND NOT WIN32)