message: there are not pthreads in windows
diff: @@ -110,7 +110,7 @@ LIBS += $$PWD/src/leveldb/libleveldb.a $$PWD/src/leveldb/libmemenv.a
  isEmpty(QMAKE_RANLIB) {
  QMAKE_RANLIB = $$replace(QMAKE_STRIP, strip, ranlib)
  }
  - LIBS += -lshlwapi -lz -pthread
  + LIBS += -lshlwapi -lz
  genleveldb.commands = cd $$PWD/src/leveldb && CC=$$QMAKE_CC CXX=$$QMAKE_CXX TARGET_OS=OS_WINDOWS_CROSSCOMPILE $(MAKE) OPT=\"$$QMAKE_CXXFLAGS $$QMAKE_CXXFLAGS_RELEASE\" libleveldb.a libmemenv.a && $$QMAKE_RANLIB $$PWD/src/leveldb/libleveldb.a && $$QMAKE_RANLIB $$PWD/src/leveldb/libmemenv.a
  }
  genleveldb.target = $$PWD/src/leveldb/libleveldb.a
  