build: made multi-job in Linux build script less aggressive

utils/build_script_linux.sh

@@ -46,25 +46,18 @@ if [ $? -ne 0 ]; then
     exit 1
 fi
 
-make -j daemon Zano;
+make -j2 daemon simplewallet connectivity_tool
 if [ $? -ne 0 ]; then
     echo "Failed to make!"
     exit 1
 fi
 
-make -j simplewallet;
+make -j1 Zano
 if [ $? -ne 0 ]; then
     echo "Failed to make!"
     exit 1
 fi
 
-make -j connectivity_tool;
-if [ $? -ne 0 ]; then
-    echo "Failed to make!"
-    exit 1
-fi
-
-
 
 read version_str <<< $(./src/zanod --version | awk '/^Zano/ { print $2 }')
 version_str=${version_str}