llvm8: remove ppc64 patch that doesn't apply

srcpkgs/llvm8/files/patches/cfe/cfe-006-ppc64-musl-elfv2.patch

@@ -1,30 +0,0 @@
---- a/clang/lib/Basic/Targets/PPC.h
-+++ b/clang/lib/Basic/Targets/PPC.h
-@@ -358,7 +358,10 @@ public:
-       ABI = "elfv2";
-     } else {
-       resetDataLayout("E-m:e-i64:64-n32:64");
--      ABI = "elfv1";
-+      if (Triple.getEnvironment() == llvm::Triple::Musl)
-+        ABI = "elfv2";
-+      else
-+        ABI = "elfv1";
-     }
- 
-     switch (getTriple().getOS()) {
-diff --git a/tools/clang/lib/Driver/ToolChains/Clang.cpp b/tools/clang/lib/Driver/ToolChains/Clang.cpp
-index 8e9c4c6a..40817ec3 100644
---- a/clang/lib/Driver/ToolChains/Clang.cpp
-+++ b/clang/lib/Driver/ToolChains/Clang.cpp
-@@ -1618,7 +1618,10 @@ void Clang::AddPPCTargetArgs(const ArgList &Args,
-         break;
-       }
- 
--      ABIName = "elfv1";
-+      if (getToolChain().getTriple().getEnvironment() == llvm::Triple::Musl)
-+        ABIName = "elfv2";
-+      else
-+        ABIName = "elfv1";
-       break;
-     }
-     case llvm::Triple::ppc64le: