- Updated configure file to check for libcommoncpp2 instead of libcurl

- Used downloadThread in search plugin update instead of libcurl (no more gui freeze by the same occasion)
- Still need to handle download from urls errors and use fallback url in search plugin update (before beta2)

qbittorrent.qc

@@ -11,7 +11,7 @@
   <dep type='libboost'>
     <required/>
   </dep>
-  <dep type='libcurl'>
+  <dep type='libcommoncpp2'>
     <required/>
   </dep>
   <dep type='python'>