nanomsg: add submodule for libnanomsg

.gitmodules

@@ -25,3 +25,6 @@
 [submodule "thirdparty/libopal"]
 	path = thirdparty/libopal
 	url = ../libopal.git
+[submodule "thirdparty/nanomsg"]
+	path = thirdparty/nanomsg
+	url = https://github.com/nanomsg/nanomsg.git

thirdparty/Makefile.inc

@@ -20,7 +20,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ###################################################################################
 
-DEPS_CMAKE = libxil libwebsockets criterion jansson
+DEPS_CMAKE = libxil libwebsockets criterion jansson nanomsg
 DEPS_AUTOCONF = libnl libconfig libcurl
 
 DEPS = $(DEPS_CMAKE) $(DEPS_AUTOCONF)

nanomsg @ 5cc00745

+Subproject commit 5cc0074524684797dd5cd9067bbccbefe1513996