Revert "Turn on Global ThinLTO by default"

This reverts commit 406e7b725b9d51ff5e9eff6ed794a9e35a2eb3e3.

Reason for revert: ndk_translation causes clang to crash

Change-Id: I61b262157f9f57c739391757d5a1f95299ddadca
diff --git a/cc/lto.go b/cc/lto.go
index 304790c..1da69bf 100644
--- a/cc/lto.go
+++ b/cc/lto.go
@@ -155,7 +155,7 @@
 }
 
 func GlobalThinLTO(ctx android.BaseModuleContext) bool {
-	return !ctx.Config().IsEnvFalse("GLOBAL_THINLTO")
+	return ctx.Config().IsEnvTrue("GLOBAL_THINLTO")
 }
 
 // Propagate lto requirements down from binaries