Reapply fix for EXPORT_C problem in backend.dll, which got lost in the merge - bug 2971
EXPORTS
_Z9LibEntryLR13CTestModuleIf @ 1 NONAME
_ZNKSt8ios_base6getlocEv @ 2 NONAME
_ZNSbIwSt11char_traitsIwESaIwEEC1EPKwRKS1_ @ 3 NONAME
_ZNSbIwSt11char_traitsIwESaIwEEC2EPKwRKS1_ @ 4 NONAME
_ZNSsC1EPKcRKSaIcE @ 5 NONAME
_ZNSsC1Ev @ 6 NONAME
_ZNSsC2EPKcRKSaIcE @ 7 NONAME
_ZNSsC2Ev @ 8 NONAME