Drop qt4 packaging.

[packaging] Drop qt4 packaging.
Signed-off-by: Marko Saukko <marko.saukko@jolla.com>

rpm/transfer-engine.spec

-Name: nemo-transferengine
-Version: 0.0.23
-Release: 0
-Summary: Transfer Engine for uploading media content and tracking transfers.
-Group: System Environment/Daemon
-License: LGPLv2.1
-URL: https://github.com/nemomobile/transfer-engine
-Source0: %{name}-%{version}.tar.gz
-BuildRequires: pkgconfig(QtCore)
-BuildRequires: pkgconfig(accounts-qt)
-BuildRequires: pkgconfig(QtSystemInfo)
-BuildRequires: desktop-file-utils
-BuildRequires: pkgconfig(mlite)
-BuildRequires: pkgconfig(accounts-qt)
-BuildRequires: pkgconfig(quillmetadata)
-BuildRequires: qt-devel-tools
-Requires: libnemotransferengine = %{version}
-
-%description
-%{summary}
-
-%package -n libnemotransferengine
-Summary: Transfer engine library.
-Group: Development/Libraries
-Requires: nemo-transferengine-qt5
-
-%description -n libnemotransferengine
-%{summary}
-
-%files -n libnemotransferengine
-%defattr(-,root,root,-)
-%{_libdir}/*.so.*
-
-%package -n libnemotransferengine-devel
-Summary: Development headers for transfer engine library.
-Group: Development/Libraries
-Requires: libnemotransferengine = %{version}
-
-%description -n libnemotransferengine-devel
-%{summary}
-
-%files -n libnemotransferengine-devel
-%defattr(-,root,root,-)
-%{_libdir}/*.so
-%{_includedir}/TransferEngine/*.h
-%{_qt_datadir}/mkspecs/features/nemotransferengine-plugin.prf
-%{_libdir}/pkgconfig/nemotransferengine.pc
-
-%package tests
-Summary:   Unit tests for Nemo TransferEngine
-License:   LGPLv2.1
-Group:     System Environment/Daemon
-
-%description tests
-Unit tests for Nemo TransferEngine
-
-%files tests
-%defattr(-,root,root,-)
-/opt/tests/nemo-transfer-engine/*
-
-
-%prep
-%setup -q -n %{name}-%{version}
-
-%build
-
-%qmake
-
-make %{?jobs:-j%jobs}
-
-%install
-rm -rf %{buildroot}
-%qmake_install
-
-%post -n libnemotransferengine
-/sbin/ldconfig
-
-%postun -n libnemotransferengine
-/sbin/ldconfig