Defer to clang for --hash-style.

We fixed the clang driver to "do the right thing" based on target api level years ago, but these manual workarounds predate that (or were copy & pasted from places that predated that). We don't need them any more.

See https://github.com/android/ndk/issues/2005 for more detail.

Change-Id: I995741b8606e389e8de8272f1cc532624516245a

cc/linker.go

@@ -530,13 +530,6 @@ func (linker *baseLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
 		flags.Global.LdFlags = append(flags.Global.LdFlags, RpathFlags(ctx)...)
 	}
 
-	if ctx.useSdk() {
-		// The bionic linker now has support gnu style hashes (which are much faster!), but shipping
-		// to older devices requires the old style hash. Fortunately, we can build with both and
-		// it'll work anywhere.
-		flags.Global.LdFlags = append(flags.Global.LdFlags, "-Wl,--hash-style=both")
-	}
-
 	flags.Global.LdFlags = append(flags.Global.LdFlags, toolchain.ToolchainLdflags())
 
 	// Version_script is not needed when linking stubs lib where the version