librcf: fix a clang compiling issue

A error was observed with clang compiler, as follows:
| src/RCF/RCF.cpp:49:
| src/RCF/ClientStub.cpp:28:
| include/RCF/Future.hpp:49:26: error: 'enrol' is a private member of 'RCF::ClientStub'

it can be fixed by declaring Future as a friend class of ClientStub.

Signed-off-by: Ming Liu <peter.x.liu@external.atlascopco.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-devtools/librcf/librcf/0001-ClientStub.hpp-fix-a-clang-compiling-issue.patch

@@ -0,0 +1,35 @@
+From d78851b6f87f2472f041102d7b3726ffc009bfad Mon Sep 17 00:00:00 2001
+From: Ming Liu <peter.x.liu@external.atlascopco.com>
+Date: Tue, 6 Jun 2017 05:54:20 +0200
+Subject: [PATCH] ClientStub.hpp: fix a clang compiling issue
+
+A error was observed with clang compiler, as follows:
+| src/RCF/RCF.cpp:49:
+| src/RCF/ClientStub.cpp:28:
+| include/RCF/Future.hpp:49:26: error: 'enrol' is a private member of 'RCF::ClientStub'
+
+it can be fixed by declaring Future as a friend class of ClientStub.
+
+Upstream-Status: Pending
+
+Signed-off-by: Ming Liu <peter.x.liu@external.atlascopco.com>
+---
+ include/RCF/ClientStub.hpp | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/include/RCF/ClientStub.hpp b/include/RCF/ClientStub.hpp
+index 9882cf4..8465625 100755
+--- a/include/RCF/ClientStub.hpp
++++ b/include/RCF/ClientStub.hpp
+@@ -372,6 +372,8 @@ namespace RCF {
+ 
+     private:
+ 
++        template<typename U>
++        friend class Future;
+         friend class FutureImplBase;
+ 
+         template<
+-- 
+2.7.4
+

meta-oe/recipes-devtools/librcf/librcf_2.2.0.0.bb

@@ -13,6 +13,7 @@ LIC_FILES_CHKSUM = "file://license.txt;md5=7586a312b9e978f9d6fac9a5780d1f84"
 SRC_URI = "http://www.deltavsoft.com/downloads/RCF-${PV}.tar.gz \
            file://0001-Add-CMake-build-files.patch \
            file://aarch64-support.patch \
+           file://0001-ClientStub.hpp-fix-a-clang-compiling-issue.patch \
           "
 
 SRC_URI[md5sum] = "7ecb3c73f7eb66dba8790b659374f690"