Previously, emacs-macport was giving the error:
- AppKit/AppKit.h: present but cannot be compiled
- Carbon/Carbon.h: present but cannot be compiled
This add "MAC_OS_X_VERSION_MIN_REQUIRED=1090" to CFLAGS to allow them
to compile with the new 10.10 headers.
Fixes#20682.
This commit removes all references to emacs24 with the exception of
emacs24-macports. The two folders in `pkgs/applications/editors` named
`emacs-24` and `emacs-24` are consolidated to a new `emacs` folder.
Various parts in nixpkgs also referenced `emacs24Packages` (pinned to
`emacs24`) explicitly where `emacsPackages` (non-pinned) is more
appropriate. These references get fixed by this commit too.
