Skip building mqtt on ubuntu precise

Author: Konstantin Nazarov

Jenkinsfile

@@ -1,10 +1,11 @@
 stage('Build'){
     packpack = new org.tarantool.packpack()
 
-    // No mosquitto library on centos 6
+    // No mosquitto library on centos 6 and ubuntu precise
     matrix = packpack.filterMatrix(
         packpack.default_matrix,
-        {!(it['OS'] == 'centos' && it['DIST'] == '6')})
+        {!(it['OS'] == 'centos' && it['DIST'] == '6') &&
+         !(it['OS'] == 'ubuntu' && it['DIST'] == 'precise')})
 
     node {
         checkout scm