Duplicated symbols when linking against Qt5

[tsieger]

There were the following problems observed when linking against Qt5.2.0 on R 3.1.0 on Win7 SP1 32bit:

 d001289.o:(.idata$2+0x0): multiple definition of `_head_Qt5PrintSupport_dll'
C:/Qt/Qt5.2.0/5.2.0/mingw48_32/lib/libQt5PrintSupport.a(d000049.o):(.idata$2+0x0): first defined here
d001473.o:(.idata$7+0x0): multiple definition of `Qt5PrintSupport_dll_iname'
C:/Qt/Qt5.2.0/5.2.0/mingw48_32/lib/libQt5PrintSupport.a(d000449.o):(.idata$7+0x0): first defined here
d001474.o:(.idata$2+0x0): multiple definition of `_head_Qt5XmlPatterns_dll'
C:/Qt/Qt5.2.0/5.2.0/mingw48_32/lib/libQt5XmlPatterns.a(d000766.o):(.idata$2+0x0): first defined here
d001665.o:(.idata$7+0x0): multiple definition of `Qt5XmlPatterns_dll_iname'
C:/Qt/Qt5.2.0/5.2.0/mingw48_32/lib/libQt5XmlPatterns.a(d001074.o):(.idata$7+0x0): first defined here
d002086.o:(.idata$2+0x0): multiple definition of `_head_Qt5Test_dll'
C:/Qt/Qt5.2.0/5.2.0/mingw48_32/lib/libQt5Test.a(d000017.o):(.idata$2+0x0): first defined here
d002127.o:(.idata$7+0x0): multiple definition of `Qt5Test_dll_iname'
C:/Qt/Qt5.2.0/5.2.0/mingw48_32/lib/libQt5Test.a(d000182.o):(.idata$7+0x0): first defined here

Disabling the Test, PrintSupport, and XmlPatterns Qt modules helped (in CMakeFiles.txt in src and kde-bindings/smoke/qt).

See #25 for details.

[lawremi]

This should be fixed with the new linking approach.