Revert "gnu: emacs: Update to 26.1."

This reverts commit bb82c3d42b. This commit
needs probably to be done on core-updates.

gnu/packages/emacs.scm

@@ -114,14 +114,14 @@
 (define-public emacs
   (package
     (name "emacs")
-    (version "26.1")
+    (version "25.3")
     (source (origin
              (method url-fetch)
              (uri (string-append "mirror://gnu/emacs/emacs-"
                                  version ".tar.xz"))
              (sha256
               (base32
-               "0b6k1wq44rc8gkvxhi1bbjxbz3cwg29qbq8mklq2az6p1hjgrx0w"))
+               "02y00y9q42g1iqgz5qhmsja75hwxd88yrn9zp14lanay0zkwafi5"))
              (patches (search-patches "emacs-exec-path.patch"
                                       "emacs-fix-scheme-indent-function.patch"
                                       "emacs-source-date-epoch.patch"))
@@ -159,8 +159,7 @@
                      " ")))))))
     (build-system glib-or-gtk-build-system)
     (arguments
-     `(#:tests? #f  ; no check target
-       #:phases
+     `(#:phases
        (modify-phases %standard-phases
          (add-before 'configure 'fix-/bin/pwd
            (lambda _

gnu/packages/patches/emacs-fix-scheme-indent-function.patch

@@ -14,16 +14,16 @@ The fix is made by Mark H Weaver <mhw@netris.org>:
 
 --- a/lisp/progmodes/scheme.el
 +++ b/lisp/progmodes/scheme.el
-@@ -494,6 +494,12 @@ indentation."
-                         (> (length function) 3)
-                         (string-match "\\`def" function)))
-                (lisp-indent-defform state indent-point))
+@@ -482,6 +482,12 @@
+ 			(> (length function) 3)
+ 			(string-match "\\`def" function)))
+ 	       (lisp-indent-defform state indent-point))
 +              ((and (null method)
 +                    (> (length function) 1)
 +                    ;; The '#' in '#:' seems to get lost, not sure why
 +                    (string-match "\\`:" function))
 +               (let ((lisp-body-indent 1))
 +                 (lisp-indent-defform state indent-point)))
-               ((integerp method)
-                (lisp-indent-specform method state
-                                      indent-point normal-indent))
+ 	      ((integerp method)
+ 	       (lisp-indent-specform method state
+ 				     indent-point normal-indent))