Rename Qt Quick 1 back to Qt 4 names

Finish renaming the installation back to what it was in Qt 4:

• library name: QtDeclarative (Qt5Declarative.dll, libQt5Declarative.so, libQt5Declarative.dylib)
• include dir:
  Unknown macro: {[QtDeclarative/xxx}

  }

• qmake's QT += }}: {{declarative