Use VERSION_BUILD where possible. Revert a change from previous commit.

src/qtlibtorrent/qbtsession.cpp

@@ -127,7 +127,7 @@ QBtSession::QBtSession()
   version << VERSION_MAJOR;
   version << VERSION_MINOR;
   version << VERSION_BUGFIX;
-  version << 0;
+  version << VERSION_BUILD;
   const QString peer_id = "qB";
   // Construct session
   s = new session(fingerprint(peer_id.toLocal8Bit().constData(), version.at(0), version.at(1), version.at(2), version.at(3)), 0);

version.pri

@@ -1,4 +1,4 @@
-PROJECT_NAME = qBittorrent
+PROJECT_NAME = qbittorrent
 
 # Define version numbers here
 VER_MAJOR = 3