Update flex

* Updated Linux from: curl https://android.googlesource.com/platform/prebuilts/build-tools/+/959ea284c41b1be5283f9eca421f1124c1ff5100/linux-x86/bin/flex?format=TEXT | base64 -d > linux-x86/flex/flex-2.5.39
* Update Darwin from: curl https://android.googlesource.com/platform/prebuilts/build-tools/+/959ea284c41b1be5283f9eca421f1124c1ff5100/darwin-x86/bin/flex?format=TEXT | base64 -d > darwin-x86/flex/flex-2.5.39

Change-Id: I8ba5038b0fe7e1d03d000fdbe39931aa332c18d2
diff --git a/darwin-x86/flex/flex-2.5.39 b/darwin-x86/flex/flex-2.5.39
index a7d978d..d776266 100755
--- a/darwin-x86/flex/flex-2.5.39
+++ b/darwin-x86/flex/flex-2.5.39
Binary files differ
diff --git a/linux-x86/flex/flex-2.5.39 b/linux-x86/flex/flex-2.5.39
index 7488e09..4e5fdfb 100755
--- a/linux-x86/flex/flex-2.5.39
+++ b/linux-x86/flex/flex-2.5.39
Binary files differ