fix on 64bit mingw
fix on 64bit mingw

mscheng/pcaspy,paulscherrerinstitute/pcaspy,mscheng/pcaspy,paulscherrerinstitute/pcaspy,HaveF/pcaspy,tectronics/pcaspy,tectronics/pcaspy,paulscherrerinstitute/pcaspy,HaveF/pcaspy