[boost] Add upstream bugreport comment to patch3

[Petr Machata]

commit b00a03fd36418392d9a597444d3fd1c4d1091762
Author: Petr Machata <pmachata at gmail.com>
Date:   Fri Jul 22 16:38:36 2011 +0200

    Add upstream bugreport comment to patch3

 boost.spec |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/boost.spec b/boost.spec
index daea589..89dad8f 100644
--- a/boost.spec
+++ b/boost.spec
@@ -91,6 +91,7 @@ Patch1: boost-cmake-soname.patch
 # it upstream: https://svn.boost.org/trac/boost/ticket/4999
 Patch2: boost-1.47.0-signals-erase.patch
 
+# https://svn.boost.org/trac/boost/ticket/5731
 Patch3: boost-1.47.0-exceptions.patch
 
 %bcond_with tests