build -I -w USRP for aarch64 (tested with 16.04 build on macchiato double...

build -I -w USRP for aarch64 (tested with 16.04 build on macchiato double shot). Needed to add copy of /usr/share/misc/config.guess nd /usr/share/misc/config.sub to /tmp/asn1c to replace the ones generated by asn1c.
Also, had to added universe to "xenial" and "xenial-updates" in /etc/apt/sources.list

cmake_targets/tools/build_helper

@@ -661,6 +661,8 @@ install_asn1c_from_source(){
     $SUDO rm -rf /tmp/asn1c
     GIT_SSL_NO_VERIFY=true git clone https://gitlab.eurecom.fr/oai/asn1c.git /tmp/asn1c
     cd /tmp/asn1c
+    cp /usr/share/misc/config.guess .
+    cp /usr/share/misc/config.sub .
     ./configure
     make -j`nproc`
     $SUDO make install