gnutls: update to 3.7.5
gnutls: update to 3.7.5

Remove obsolete configure options `--with-libregex-libs` and `--enable-local-libopts`
stahta01/MINGW-packages,stahta01/MINGW-packages,oscarfv/MINGW-packages,Alexpux/MINGW-packages,fabiangreffrath/MINGW-packages,stahta01/MINGW-packages,oscarfv/MINGW-packages,lhmouse/MINGW-packages,JPeterMugaas/MINGW-packages,oscarfv/MINGW-packages,stahta01/MINGW-packages,oroppas/MINGW-packages,oscarfv/MINGW-packages,fabiangreffrath/MINGW-packages,oroppas/MINGW-packages,stahta01/MINGW-packages,lhmouse/MINGW-packages,lhmouse/MINGW-packages,oroppas/MINGW-packages,Alexpux/MINGW-packages,Alexpux/MINGW-packages,oscarfv/MINGW-packages,fabiangreffrath/MINGW-packages,fabiangreffrath/MINGW-packages,Alexpux/MINGW-packages,oroppas/MINGW-packages,JPeterMugaas/MINGW-packages,lhmouse/MINGW-packages,oscarfv/MINGW-packages,stahta01/MINGW-packages,oroppas/MINGW-packages,Alexpux/MINGW-packages,lhmouse/MINGW-packages,fabiangreffrath/MINGW-packages,JPeterMugaas/MINGW-packages,JPeterMugaas/MINGW-packages,JPeterMugaas/MINGW-packages,Alexpux/MINGW-packages,lhmouse/MINGW-packages,JPeterMugaas/MINGW-packages,oroppas/MINGW-packages,fabiangreffrath/MINGW-packages