M #-: Adding missing scons dependency (#623)

(cherry picked from commit a0ac924)

Author: fpolanco-one

content/software/installation_process/build_from_source_code/compile.md

@@ -107,7 +107,7 @@ The packages do a `system-wide` installation. To create a similar environment, c
 oneadmin@frontend:~/ $> wget <opennebula tar gz>
 oneadmin@frontend:~/ $> tar xzf <opennebula tar gz>
 oneadmin@frontend:~/ $> cd opennebula-x.y.z
-oneadmin@frontend:~/opennebula-x.y.z/ $> scons -j2 mysql=yes syslog=yes fireedge=yes
+oneadmin@frontend:~/opennebula-x.y.z/ $> scons -j2 mysql=yes syslog=yes fireedge=yes grpcproto=yes
 [ lots of compiling information ]
 scons: done building targets.
 oneadmin@frontend:~/opennebula-x.y.z $> sudo ./install.sh -u oneadmin -g oneadmin