[gedit] build: remove useless variable assignment before error

[Sébastien Wilmet <swilmet src gnome org>]

commit c873e55e14d4b1b718ef46c344a7a8c3c378a16c
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Nov 26 17:32:39 2015 +0100

    build: remove useless variable assignment before error
    
    The AC_MSG_ERROR() anyway stops the program.

 configure.ac |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index d555d88..47d7aa7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -246,7 +246,6 @@ if test "x$enable_spell" = "xyes" ; then
                          have_gspell=yes, have_gspell=no)
 
        if test "x$have_gspell" = "xno"; then
-               enable_spell=no
                AC_MSG_ERROR([gspell library not found or too old. Use --disable-spell to build without spell 
plugin.])
        fi
 fi