Remove GCC checks

Clang is always used now, so we can remove all the GCC checks. Removing
GCC-specific configuration will happen in the next CL.

Test: m
Change-Id: I4835ecf6062159315d0dfb07b098e60bff033a8a
diff --git a/cc/object.go b/cc/object.go
index 2577195..0010621 100644
--- a/cc/object.go
+++ b/cc/object.go
@@ -64,11 +64,7 @@
 }
 
 func (*objectLinker) linkerFlags(ctx ModuleContext, flags Flags) Flags {
-	if flags.Clang {
-		flags.LdFlags = append(flags.LdFlags, ctx.toolchain().ToolchainClangLdflags())
-	} else {
-		flags.LdFlags = append(flags.LdFlags, ctx.toolchain().ToolchainLdflags())
-	}
+	flags.LdFlags = append(flags.LdFlags, ctx.toolchain().ToolchainClangLdflags())
 
 	return flags
 }