comms/fldigi: Update to 4.2.05

• Removed bogus png dependency
• modified autoreconf to autoreconf:compile
• updated pkg-plist

From upstream:

2024-04-23 dave-w1hkj <w1hkj@bellsouth.net>

b4256bd6a: Version 4.2.05

2024-04-23 kk5vd <kk5vd@yahoo.com>

ac7f2ae04: Documentation Update
98504be5f: RSID Scripting

2024-04-20 dave-w1hkj <w1hkj@bellsouth.net>

b1cf7440a: winkeyer
51554e4dc: Main X-Y-W-H restore
79c2f941d: pi-winkeyer
467c17391: Wordsworth CW
580fdc566: Default language
e64e3bc15: RSID Min Bandwidth
e2b68197f: OFDM documentation
2d021cff7: Deprecate °
7debbe875: DominoEX MFSK Thor s/n

2024-03-24 Steve Magnuson <steve.magnuson@gmail.com>

99db787dc: gpio ptt