Rename ninja variables with Clang in the name

Rename the ninja variables that have an extraneous Clang in the name,
since there are no longer any non-Clang variables.

Bug: 68947919
Test: no change to command lines used to build mmma bionic
Change-Id: I081d5e1d423a66d55faece6cb1d265cd5e504d5f
diff --git a/rust/config/x86_darwin_host.go b/rust/config/x86_darwin_host.go
index ddd93e8..8ff0dd4 100644
--- a/rust/config/x86_darwin_host.go
+++ b/rust/config/x86_darwin_host.go
@@ -78,7 +78,7 @@
 
 func (t *toolchainDarwinX8664) ToolchainLinkFlags() string {
 	// Prepend the lld flags from cc_config so we stay in sync with cc
-	return "${cc_config.DarwinClangLldflags} ${config.DarwinToolchainLinkFlags} ${config.DarwinToolchainX8664LinkFlags}"
+	return "${cc_config.DarwinLldflags} ${config.DarwinToolchainLinkFlags} ${config.DarwinToolchainX8664LinkFlags}"
 }
 
 func (t *toolchainDarwinX8664) ToolchainRustFlags() string {