Move T252 back to bugs until it is fixed.

--HG--
rename : tests/compile/bad_c_struct_T252.pyx => tests/bugs/bad_c_struct_T252.pyx

diff --git a/tests/compile/bad_c_struct_T252.pyx b/tests/bugs/bad_c_struct_T252.pyx
similarity index 100%
rename from tests/compile/bad_c_struct_T252.pyx
rename to tests/bugs/bad_c_struct_T252.pyx