Log Message:
algol68g: Update to 3.0.4

* Enable compiler mode (--compile) for NetBSD at least.

Changelog:
Version 3.0.3 and 3.0.4
* Unavailable.

Version 3.0.1-4, January/February 2022
* Several bug fixes, reported for 3.0.0.
* Updates a68g.exe to GSL 2.7.1 and R mathlib 4.1.2.

Version 3.0.0, December 2021
* On platforms that support them: 64 bit INT/BITS and 128-bit LONG INT, LONG \ 
BITS and LONG REAL.
  These platforms include amd64, x86_64 and i386 with GCC.
* More bindings for routines from the GNU Scientific Library.
* Adds a generalized incomplete gamma function.
* Builds with R mathlib bindings, if available.
* Fixes several minor bugs.