Remove cdefs.pxi from .pxd/.pxi files

[jdemeyer]

To continue #18455, we remove cdefs.pxi from all .pxi/.pxd files.

We also fold fplll.pxi and singular-cdefs.pxi in the corresponding .pxd files.

Depends on #18455

Component: cython

Author: Jeroen Demeyer

Branch/Commit: 11bd576

Reviewer: Marc Mezzarobba

Issue created by migration from https://trac.sagemath.org/ticket/18519

[jdemeyer]

Branch: u/jdemeyer/ticket/18519

[jdemeyer]

New commits:

2ed346b	Remove unneeded inclusions of cdefs.pxi
57e9278	More removals of cdefs.pxi
370106d	Even more removals of cdefs
1accad6	Remove cdefs.pxi from .pxd/.pxi files

[jdemeyer]

Commit: 1accad6

[mezzarobba]

comment:4

In the following comment (moved from singular-cdefs.pxi to singular/decl.pxd), is “deferences” a typo for “references” or a technical term I don't know?

+NOTE: our ring, poly etc. types are not the SINGULAR ring, poly,
+etc. types. They are deferences. So a SINGULAR ring is a ring pointer
+here.

[jdemeyer]

comment:5

I think it's a typo for "dereferences" although I don't know if that is a correct noun.

[sagetrac-git]

Changed commit from 1accad6 to 11bd576

[sagetrac-git]

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

11bd576

Clarify note

[mezzarobba]

Reviewer: Marc Mezzarobba

[vbraun]

Changed branch from u/jdemeyer/ticket/18519 to 11bd576