gnu: Rename (gnu packages dwm) to (gnu packages suckless).

* gnu/packages/dwm.scm: Rename this ...
* gnu/packages/suckless.scm: ... to this.
* gnu-system.am (GNU_SYSTEM_MODULES): Change dwm.scm to suckless.scm.

gnu-system.am

@@ -86,7 +86,6 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/dns.scm				\
   gnu/packages/docbook.scm			\
   gnu/packages/doxygen.scm			\
-  gnu/packages/dwm.scm				\
   gnu/packages/ebook.scm			\
   gnu/packages/ed.scm				\
   gnu/packages/elf.scm				\
@@ -281,6 +280,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/ssh.scm				\
   gnu/packages/stalonetray.scm			\
   gnu/packages/statistics.scm			\
+  gnu/packages/suckless.scm			\
   gnu/packages/swig.scm				\
   gnu/packages/sxiv.scm				\
   gnu/packages/synergy.scm			\

gnu/packages/suckless.scm

@@ -17,7 +17,7 @@
 ;;; You should have received a copy of the GNU General Public License
 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
-(define-module (gnu packages dwm)
+(define-module (gnu packages suckless)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix packages)
   #:use-module (guix download)