added _HAVE_ZLIB to stop compression being set without zlib
added _HAVE_ZLIB to stop compression being set without zlib

Distrotech/reportlab,Distrotech/reportlab,Distrotech/reportlab,Distrotech/reportlab,Distrotech/reportlab,kanarelo/reportlab,kanarelo/reportlab,kanarelo/reportlab,kanarelo/reportlab,kanarelo/reportlab