disable compile time error in favour of a runtime error as it might be too strict and break working code

Was giving a gcc error for a local named "zero"

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

--HG--
rename : tests/compile/coercearraytoptr.pyx => tests/run/coercearraytoptr.pyx