Move includes of interrupt.pxi to pyx files

[jdemeyer]

Move lines

include "sage/ext/interrupt.pxi"

from .pxd to .pyx files.

In #18027, it will become obligatory to put this include line in the .pyx file.

[jdemeyer]

New commits:

​ce992d2

Move includes of interrupt.pxi to .pyx files

[vbraun]

Cythonizing sage/graphs/planarity.pyx

Error compiling Cython file:
------------------------------------------------------------
...
    # Building the dictionary associating id to labels
    for id,label in enumerate(g.vertices()):
        label_id[label] = id

    G.n = g.order()
    G.G = <c_adj **> sage_malloc(G.n*sizeof(c_adj *))
                               ^
------------------------------------------------------------

sage/graphs/modular_decomposition.pyx:119:32: undeclared name not builtin: sage_malloc

Error compiling Cython file:
------------------------------------------------------------
...
    # Building the dictionary associating id to labels
    for id,label in enumerate(g.vertices()):
        label_id[label] = id

    G.n = g.order()
    G.G = <c_adj **> sage_malloc(G.n*sizeof(c_adj *))
         ^
------------------------------------------------------------

[jdemeyer]

This is exactly the problem that #18145 was meant to detect, so that ticket did its job.

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​c98c51a

Add includes to modular_decomposition.pyx