[FIX] Addding required include for ptrdiff_t.
[FIX] Addding required include for ptrdiff_t.

Was missing, triggered by C++11 mode of MinGW 4.7.2.

bayolau/seqan,PF2-pasteur-fr/seqan,h-2/seqan,limeng12/seqan,catkira/seqan,xp3i4/seqan,h-2/seqan,PF2-pasteur-fr/seqan,bestrauc/seqan,xenigmax/seqan,h-2/seqan,budach/seqan,PF2-pasteur-fr/seqan,bayolau/seqan,weese/seqan,xenigmax/seqan,catkira/seqan,holtgrewe/seqan,hannespetur/SeqAnHTS,catkira/seqan,JohnReid/seqan,bayolau/seqan,bestrauc/seqan,limeng12/seqan,limeng12/seqan,holtgrewe/seqan,hannespetur/SeqAnHTS,bestrauc/seqan,hannespetur/SeqAnHTS,xp3i4/seqan,budach/seqan,catkira/seqan,holtgrewe/seqan,ktrappe/seqan,hannespetur/SeqAnHTS,hannespetur/SeqAnHTS,limeng12/seqan,xp3i4/seqan,xp3i4/seqan,JohnReid/seqan,budach/seqan,weese/seqan,xenigmax/seqan,holtgrewe/seqan,xenigmax/seqan,bestrauc/seqan,PF2-pasteur-fr/seqan,weese/seqan,xenigmax/seqan,JohnReid/seqan,PF2-pasteur-fr/seqan,bestrauc/seqan,PF2-pasteur-fr/seqan,catkira/seqan,hannespetur/SeqAnHTS,hannespetur/SeqAnHTS,budach/seqan,h-2/seqan,PF2-pasteur-fr/seqan,h-2/seqan,xp3i4/seqan,hannespetur/SeqAnHTS,xp3i4/seqan,catkira/seqan,limeng12/seqan,weese/seqan,bayolau/seqan,ktrappe/seqan,h-2/seqan,JohnReid/seqan,bayolau/seqan,JohnReid/seqan,ktrappe/seqan,xp3i4/seqan,catkira/seqan,PF2-pasteur-fr/seqan,ktrappe/seqan,h-2/seqan,ktrappe/seqan,bayolau/seqan,limeng12/seqan,bayolau/seqan,PF2-pasteur-fr/seqan,holtgrewe/seqan,ktrappe/seqan,limeng12/seqan,catkira/seqan,hannespetur/SeqAnHTS,ktrappe/seqan,weese/seqan,xenigmax/seqan,h-2/seqan,holtgrewe/seqan,ktrappe/seqan,limeng12/seqan,JohnReid/seqan,bestrauc/seqan,holtgrewe/seqan,xenigmax/seqan,holtgrewe/seqan,limeng12/seqan,h-2/seqan,budach/seqan,budach/seqan,ktrappe/seqan,JohnReid/seqan,budach/seqan,JohnReid/seqan,weese/seqan,bestrauc/seqan,bayolau/seqan,budach/seqan,JohnReid/seqan,bayolau/seqan,budach/seqan,weese/seqan,weese/seqan,xp3i4/seqan,bestrauc/seqan,xenigmax/seqan,xp3i4/seqan,catkira/seqan