bin2txt: Remove extra new line when version is printed, optimize Makefile as well

[kobenairb]

Hi all,

Some small improvements for bin2txt. I slighty optimized the Makefile and remove useless new lines in bin2txt.c when printing version.

Here the changes performed on the Makefile:

• Uses := instead of = for variable assignment to prevent unnecessary re-evaluation.
• Uses $(shell date +%Y%m%d) instead of invoking the date command multiple times.
• Uses automatic variable expansion to reduce duplication in the Makefile.

For the bin2txt.c source file, I just removed the \n\n for the PrintVersion function and applied some formating (extra spaces, sort include ...).