message: Update client version to 4.3
diff: // These need to be macros, as version.cpp's and bitcoin-qt.rc's voodoo requires it
  #define CLIENT_VERSION_MAJOR 4
  -#define CLIENT_VERSION_MINOR 2
  +#define CLIENT_VERSION_MINOR 3
  #define CLIENT_VERSION_REVISION 0
  #define CLIENT_VERSION_BUILD 0
  