Add a TODO to clean up libgcrypt & gnutls dependency.

printing/backend/print_backend_cups.cc

Index: printing/backend/print_backend_cups.cc
diff --git a/printing/backend/print_backend_cups.cc b/printing/backend/print_backend_cups.cc
index 82c25f3bf1a81291e84cb7aae23881247365feb6..c2f236b5e891949a08c36eb535314fa6765a1f68 100644
--- a/printing/backend/print_backend_cups.cc
+++ b/printing/backend/print_backend_cups.cc
@@ -42,6 +42,10 @@ namespace {
 // Google search for 'gnutls thread safety' provided a solution that
 // initialized gcrypt and gnutls.
 
+// TODO(phajdan.jr): Remove this after https://bugs.g10code.com/gnupg/issue1197
+// gets fixed on all Linux distros we support (i.e. when they ship libgcrypt
+// with the fix).
+
 // Initially, we linked with -lgnutls and simply called gnutls_global_init(),
 // but this did not work well since we build one binary on Ubuntu Hardy and
 // expect it to run on many Linux distros. (See http://crbug.com/46954)