gnu: xf86-video-siliconmotion: Update to 1.7.8.

* gnu/packages/patches/xf86-video-siliconmotion-remove-mibstore.patch:
  Delete file.
* gnu-system.am (dist_patch_DATA): Remove it.
* gnu/packages/xorg.scm (xf86-video-siliconmotion): Update to 1.7.8.
  [source]: Remove patch.

gnu-system.am

@@ -773,7 +773,6 @@ dist_patch_DATA =						\
   gnu/packages/patches/xf86-video-mach64-glibc-2.20.patch	\
   gnu/packages/patches/xf86-video-nv-remove-mibstore.patch	\
   gnu/packages/patches/xf86-video-openchrome-glibc-2.20.patch	\
-  gnu/packages/patches/xf86-video-siliconmotion-remove-mibstore.patch \
   gnu/packages/patches/xf86-video-sis-fix-exa-crash.patch	\
   gnu/packages/patches/xf86-video-sis-update-api.patch		\
   gnu/packages/patches/xf86-video-tdfx-remove-mibstore.patch	\

gnu/packages/patches/xf86-video-siliconmotion-remove-mibstore.patch

@@ -1,16 +0,0 @@
-Removes references to mibstore.h and miInitializeBackingStore, which
-have been removed from xorg-server.  Zack Rusin <zackr@vmware.com>
-wrote: "It was a noop for at least 5 years and it has been removed."
-See: http://patches.openembedded.org/patch/46133/
-
---- xf86-video-siliconmotion-1.7.7/src/smi_driver.c.~1~	2012-07-17 00:53:21.000000000 -0400
-+++ xf86-video-siliconmotion-1.7.7/src/smi_driver.c	2014-12-19 01:30:16.708884086 -0500
-@@ -1750,8 +1750,6 @@
- 		   "Done writing mode.  Register dump:\n");
-     SMI_PrintRegs(pScrn);
- 
--    miInitializeBackingStore(pScreen);
--
- #ifdef HAVE_XMODES
-     xf86DiDGAInit(pScreen, (unsigned long)(pSmi->FBBase + pScrn->fbOffset));
- #endif

gnu/packages/xorg.scm

@@ -3132,7 +3132,7 @@ (define-public xf86-video-savage
 (define-public xf86-video-siliconmotion
   (package
     (name "xf86-video-siliconmotion")
-    (version "1.7.7")
+    (version "1.7.8")
     (source
       (origin
         (method url-fetch)
@@ -3142,10 +3142,7 @@ (define-public xf86-video-siliconmotion
                ".tar.bz2"))
         (sha256
           (base32
-           "1an321kqvsxq0z35acwl99lc8hpdkayw0q180744ypcl8ffvbf47"))
-        (patches
-         (list
-          (search-patch "xf86-video-siliconmotion-remove-mibstore.patch")))))
+           "1sqv0y31mi4zmh9yaxqpzg7p8y2z01j6qys433hb8n4yznllkm79"))))
     (build-system gnu-build-system)
     (inputs `(("xorg-server" ,xorg-server)))
     (native-inputs `(("pkg-config" ,pkg-config)))