- Avoid address space randomization during emacs build
- Check for active Execution Shield as this breaks emacs

- Diable experimental cairo support as it cause trouble with spacemacs
as well as with the w3 mode

- Update to emacs version 25.1
* Next major release
* Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
* Emacs can now load shared/dynamic libraries (modules).
* Network security (TLS/SSL certificate validity and the like)
* 'C-h l' now also lists the commands that were run.
* New option 'switch-to-buffer-in-dedicated-window'
* The option 'even-window-heights' has been renamed to 'even-window-sizes'
* 'terpri' gets an optional arg ENSURE to conditionally output a newline.
* 'insert-register' now leaves point after the inserted text
* The new variable 'term-file-aliases' replaces some files from lisp/term.
* New variable 'system-configuration-features', listing some of the main
features that Emacs was compiled with.
* A password is now hidden also when typed in batch mode.
* The Emacs pseudo-random number generator can be securely seeded.
* New input methods: 'tamil-dvorak', 'programmer-dvorak' and 'probhat'.
* 'M-x' suggests shorthands and ignores obsolete commands for completion.
* Changes in undo
* New command 'comment-line' bound to 'C-x C-;'.
* New and improved facilities for inserting Unicode characters
* New minor mode 'global-eldoc-mode' is enabled by default.
* Emacs now uses "bracketed paste mode" on text terminals that support it.
* Emacs now supports the latest version of the UBA.
* You can access 'mouse-buffer-menu' ('C-down-mouse-1') using 'C-f10'.