emacs: Add withCompressInstall flag

When enabled (the default), Emacs compresses its files (.c, .el, .info,
and so on) before installing them.

Disabling the option with `withCompressInstall = false` results in the
suppression of that compression step. This increases disk space, but is
slightly faster for some operations; Emacs does not have to decompress
these files on the fly when, for example, jumping to the definition of a
built-in function.

pkgs/applications/editors/emacs/make-emacs.nix

@@ -90,6 +90,7 @@
 , withXinput2 ? withX && lib.versionAtLeast version "29"
 , withXwidgets ? !stdenv.isDarwin && !noGui && (withGTK3 || withPgtk)
 , withSmallJaDic ? false
+, withCompressInstall ? true
 
 # Options
 , siteStart ? ./site-start.el
@@ -339,6 +340,7 @@ mkDerivation (finalAttrs: {
   ++ lib.optional withXinput2 "--with-xinput2"
   ++ lib.optional withXwidgets "--with-xwidgets"
   ++ lib.optional withSmallJaDic "--with-small-ja-dic"
+  ++ lib.optional (!withCompressInstall) "--without-compress-install"
   ;
 
   env = lib.optionalAttrs withNativeCompilation {