Improve Makefile

[meator]

These changes were inspired by hwinfos Makefile and by the GNU make manual.

The current version detection system and the changelog are fully dependent on git. This complicates building from release archives. One of my commits adds the LIBX86EMU_VERSION variable that makes things simpler, but this is not a good solution in my opinion. Another solution to this problem is to add a VERSION file that would be incremented on every release. This wouldn't change the logic that much since Makefile already uses VERSION.

And while we're here, I'll ask some questions: Is the $(ARCH) variable used for anything in the current version of libx86emus Makefile and do you have any specific reason to use /usr/lib64 instead of /usr/lib?

[wfeldt]

I'll take some time to look trough it all. So far:

• I agree, the VERSION handling is not ideal; I've changed it a bit in some of my other projects
• I don't really like .gitignore and I'd rather remove it instead of extending; IMHO a 'make clean' should leave the git repo in a clean state - so that git status looks nice
• /usr/lib64 is the common location on 64 bit architectures - not on all, yes - but that's why the code tries to detect the situation
• $ARCH is unused and can go - I believe it was used at some point for this lib64 decision

[meator]

Thanks for your response! I'll remove the .gitignore commit.

[wfeldt]

Just a heads-up: I haven't forgotten...