gnu: x265: Update to 3.0.

* gnu/packages/video.scm (x265): Update to 3.0.
[source]: Remove patch.
* gnu/packages/patches/x265-detect512-all-arches.patch: Remove file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu/local.mk

@@ -1333,7 +1333,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/wpa-supplicant-fix-nonce-reuse.patch	\
   %D%/packages/patches/wpa-supplicant-krack-followups.patch	\
   %D%/packages/patches/x265-arm-flags.patch			\
-  %D%/packages/patches/x265-detect512-all-arches.patch		\
   %D%/packages/patches/xboing-CVE-2004-0149.patch		\
   %D%/packages/patches/xf86-video-ark-remove-mibstore.patch	\
   %D%/packages/patches/xf86-video-geode-glibc-2.20.patch	\

gnu/packages/patches/x265-detect512-all-arches.patch

@@ -1,37 +0,0 @@
-https://sources.debian.org/data/main/x/x265/2.9-3/debian/patches/0003-detect512-is-needed-on-all-architectures.patch
-
-From: Adam Sampson <unknown@bitbucket>
-Date: Sun, 14 Oct 2018 14:04:18 +0200
-Subject: detect512 is needed on all architectures
-
----
- source/common/cpu.cpp | 9 +++++----
- 1 file changed, 5 insertions(+), 4 deletions(-)
-
-diff --git a/source/common/cpu.cpp b/source/common/cpu.cpp
-index 0681ff5..fa687da 100644
---- a/source/common/cpu.cpp
-+++ b/source/common/cpu.cpp
-@@ -110,6 +110,11 @@ const cpu_name_t cpu_names[] =
-     { "", 0 },
- };
- 
-+bool detect512()
-+{
-+    return(enable512);
-+}
-+
- #if X265_ARCH_X86
- 
- extern "C" {
-@@ -123,10 +128,6 @@ uint64_t PFX(cpu_xgetbv)(int xcr);
- #pragma warning(disable: 4309) // truncation of constant value
- #endif
- 
--bool detect512()
--{
--    return(enable512);
--}
- uint32_t cpu_detect(bool benableavx512 )
- {
- 

gnu/packages/video.scm

@@ -399,7 +399,7 @@ (define-public mkvtoolnix
 (define-public x265
   (package
     (name "x265")
-    (version "2.9")
+    (version "3.0")
     (outputs '("out" "static"))
     (source
       (origin
@@ -408,9 +408,8 @@ (define-public x265
                             "x265_" version ".tar.gz"))
         (sha256
          (base32
-          "090hp4216isis8q5gb7bwzia8rfyzni54z21jnwm97x3hiy6ibpb"))
-        (patches (search-patches "x265-arm-flags.patch"
-                                 "x265-detect512-all-arches.patch"))
+          "0qh65wdpasrspkm1y0dlfa123myax568yi0sas0lmg5b1hkgrff5"))
+        (patches (search-patches "x265-arm-flags.patch"))
         (modules '((guix build utils)))
         (snippet '(begin
                     (delete-file-recursively "source/compat/getopt")