- Fix build docbook-xsl is needed along with asciidoc + xsltproc
- upgrade to fldigi-3.21.68 small fixes including RTTY filters
- log2 is now in libm no need to kludge it

Approved by:	portmgr (miwi)
- Fix dependency on GTK2 for GTK2 option

PR:		ports/177518
Submitted by:	Roland Smith <rsmith at xs4all.nl>
Approved by:	portmgr