gdk-pixbuf2: re-enable gdiplus loaders (#2376)
gdk-pixbuf2: re-enable gdiplus loaders (#2376)

(they were disabled in 5b53585ec2b119eaf37517d84ab2a1940430146b)

GDI+ loaders neet to be built into gdk-pixbuf to prevent the bug described in https://bugzilla.redhat.com/show_bug.cgi?id=795152#c1 (see also https://bugs.launchpad.net/inkscape/+bug/1467103)
InitialForce/MINGW-packages,Alexpux/MINGW-packages,Ede123/MINGW-packages,fabiangreffrath/MINGW-packages,fabiangreffrath/MINGW-packages,dsogari/MINGW-packages,jtanx/MINGW-packages,oscarfv/MINGW-packages,Optiligence/MINGW-packages,Chocobo1/MINGW-packages,stambaughw/MINGW-packages,dsogari/MINGW-packages,filnet/MINGW-packages,mashir43/MINGW-packages,nazar554/MINGW-packages,Ede123/MINGW-packages,Alexpux/MINGW-packages,Alexpux/MINGW-packages,KrullBorg/MINGW-packages,mati865/MINGW-packages,oroppas/MINGW-packages,emmenlau/MINGW-packages,irakhlin/MINGW-packages,KrullKorg/MINGW-packages,Chocobo1/MINGW-packages,fabiangreffrath/MINGW-packages,oscarfv/MINGW-packages,Alexpux/MINGW-packages,KrullKorg/MINGW-packages,Ede123/MINGW-packages,dscho/MINGW-packages,JPeterMugaas/MINGW-packages,zklhp/MINGW-packages,jtanx/MINGW-packages,stambaughw/MINGW-packages,Ede123/MINGW-packages,RickLeaf/MINGW-packages,oroppas/MINGW-packages,Chocobo1/MINGW-packages,juergenpf/MINGW-packages,juergenpf/MINGW-packages,oscarfv/MINGW-packages,Optiligence/MINGW-packages,peterbud/MINGW-packages,qme/MINGW-packages,jtanx/MINGW-packages,dscho/MINGW-packages,jeroenooms/MINGW-packages,irakhlin/MINGW-packages,stahta01/MINGW-packages,zklhp/MINGW-packages,InitialForce/MINGW-packages,lhmouse/MINGW-packages,Optiligence/MINGW-packages,int19h/MINGW-packages,lhmouse/MINGW-packages,emmenlau/MINGW-packages,signotorez/MINGW-packages,oroppas/MINGW-packages,InitialForce/MINGW-packages,KrullKorg/MINGW-packages,JPeterMugaas/MINGW-packages,nickoe/MINGW-packages,nazar554/MINGW-packages,int19h/MINGW-packages,stahta01/MINGW-packages,filnet/MINGW-packages,dscho/MINGW-packages,oroppas/MINGW-packages,RickLeaf/MINGW-packages,oroppas/MINGW-packages,Optiligence/MINGW-packages,zklhp/MINGW-packages,emmenlau/MINGW-packages,stambaughw/MINGW-packages,nickoe/MINGW-packages,Alexpux/MINGW-packages,jeroenooms/MINGW-packages,mati865/MINGW-packages,oscarfv/MINGW-packages,JPeterMugaas/MINGW-packages,fabiangreffrath/MINGW-packages,juergenpf/MINGW-packages,qme/MINGW-packages,signotorez/MINGW-packages,bjlemke/MINGW-packages,filnet/MINGW-packages,mati865/MINGW-packages,dscho/MINGW-packages,qme/MINGW-packages,int19h/MINGW-packages,mati865/MINGW-packages,JPeterMugaas/MINGW-packages,oscarfv/MINGW-packages,fabiangreffrath/MINGW-packages,int19h/MINGW-packages,lhmouse/MINGW-packages,nazar554/MINGW-packages,stahta01/MINGW-packages,irakhlin/MINGW-packages,lhmouse/MINGW-packages,bjlemke/MINGW-packages,lhmouse/MINGW-packages,jtanx/MINGW-packages,stahta01/MINGW-packages,fabiangreffrath/MINGW-packages,peterbud/MINGW-packages,KrullBorg/MINGW-packages,oroppas/MINGW-packages,git-for-windows/MINGW-packages,bjlemke/MINGW-packages,irakhlin/MINGW-packages,RickLeaf/MINGW-packages,peterbud/MINGW-packages,juergenpf/MINGW-packages,stahta01/MINGW-packages,mashir43/MINGW-packages,nickoe/MINGW-packages,qme/MINGW-packages,JPeterMugaas/MINGW-packages,KrullBorg/MINGW-packages,bjlemke/MINGW-packages,peterbud/MINGW-packages,dsogari/MINGW-packages,JPeterMugaas/MINGW-packages,KrullBorg/MINGW-packages,git-for-windows/MINGW-packages,RickLeaf/MINGW-packages,jeroenooms/MINGW-packages,nazar554/MINGW-packages,mati865/MINGW-packages,oscarfv/MINGW-packages,signotorez/MINGW-packages,git-for-windows/MINGW-packages,lhmouse/MINGW-packages,Alexpux/MINGW-packages,mashir43/MINGW-packages,stahta01/MINGW-packages,mashir43/MINGW-packages,dscho/MINGW-packages