No global ThinLTO for bionic

There are multiple build breakages with bionic when we enable ThinLTO
globally. Opt bionic out of ThinLTO for now.

#global-thinlto-opt-out

Test: TreeHugger
Bug: 169004486
Change-Id: I546a8074f9c3e0ddbd01d3b7cd730e215e3c0c49
diff --git a/libc/Android.bp b/libc/Android.bp
index 61d99ac..c94be62 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1738,6 +1738,10 @@
     // Sorting bss symbols by size usually results in less dirty pages at run
     // time, because small symbols are grouped together.
     sort_bss_symbols_by_size: true,
+
+    lto: {
+        never: true,
+    },
 }
 
 genrule {