gnu: Remove llvm-6.

* gnu/packages/llvm.scm (llvm-6): Delete variable.

Change-Id: I53839e5d7bfe560458628fb2c4c42bd6c2d0566d

gnu/packages/llvm.scm

@@ -1032,29 +1032,6 @@ Library.")
 (define-public clang-toolchain-12
   (make-clang-toolchain clang-12 libomp-12))
 
-(define-public llvm-6
-  (package
-    (inherit llvm-12)
-    (version "6.0.1")
-    (source (origin
-              (method url-fetch)
-              (uri (llvm-uri "llvm" version))
-              (sha256
-               (base32
-                "1qpls3vk85lydi5b4axl0809fv932qgsqgdgrk098567z4jc7mmn"))))
-    (arguments
-     (substitute-keyword-arguments (package-arguments llvm-12)
-       ((#:phases phases)
-        #~(modify-phases #$phases
-            (delete 'delete-failing-tests)))))
-    (native-inputs
-     `(("python" ,python-wrapper)
-       ("perl"   ,perl)
-       ;; In llvm-11 riscv64 support was added manually to config.guess.
-       ,@(if (target-riscv64?)
-           `(("config" ,config))
-           '())))))
-
 (define-public llvm-16
   (make-llvm "16.0.6"))