Typo in types.pxd

Cython/Includes/posix/types.pxd

-# Note that the actual size of these types is system-dependant, and
+# Note that the actual size of these types is system-dependent, and
 # can't be detected at C compile time.  However, the generated C code
 # will correctly use the actual size of these types *except* for
 # determining promotion in binary arithmetic expressions involving