devel/ghidra: fix permissions be able to run ghidra from the command line

Also:
 - remove from SHEBANG_FILES those that are related with debugging
 - add a desktop file + icon from:
   https://github.com/NationalSecurityAgency/ghidra/discussions/3709
 - add a pkg-message
 - configure JAVA_HOME using the default installed java version

PR:	280494
Fixes:	e2b8d2a6 (update 9.1 → 11.1.2, take maintainership)
MFH:	2024Q3