-fno-emulated-tls is the default now.

bionic doesn't target old api levels.

Test: treehugger
Change-Id: I3534dd3fd34b9130fd5500dbd6a3a314081e9036
diff --git a/libc/Android.bp b/libc/Android.bp
index 6f36aad..fdf34eb 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -67,9 +67,6 @@
     // __dso_handle needs to have default visibility on ARM32. See b/73485611.
     "-Wexit-time-destructors",
 
-    // GWP-ASan requires platform TLS.
-    "-fno-emulated-tls",
-
     // We know clang does a lot of harm by rewriting what we've said, and sadly
     // never see any good it does, so let's just ask it to do what we say...
     // (The specific motivating example was clang turning a loop that would only