Log Message:
emulators/vba: Fix for libz >= 1.2.6

The current package won't compile if using libz >= 1.2.6 due to a typedef
change of GzFile.  Fix inspired by r1091 at vbam.svn.sourceforge.net
Package broke after DragonFly upgraded system libz from 1.2.5 to 1.2.7