Switch libcompiler_rt-extras to LateStaticLibs.

Bug: http://b/28149048
Test: Rebuild world (and check on new clang dependencies).

The latest clang inserts even more dependencies for
libcompiler_rt-extras (in the form of __unorddf2/__unordtf2), so we need
to ensure that it gets linked after libm.a for binaries that statically
pull it in.

Change-Id: I22a1deb63a7ed05f77af6f91f0f7a21dcf156608
diff --git a/cc/cc.go b/cc/cc.go
index f8723bb..89f40b3 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -1337,7 +1337,7 @@
 	deps.ReexportSharedLibHeaders = append(deps.ReexportSharedLibHeaders, linker.Properties.Export_shared_lib_headers...)
 
 	if !ctx.sdk() && ctx.ModuleName() != "libcompiler_rt-extras" {
-		deps.StaticLibs = append(deps.StaticLibs, "libcompiler_rt-extras")
+		deps.LateStaticLibs = append(deps.LateStaticLibs, "libcompiler_rt-extras")
 	}
 
 	if ctx.Device() {