ignore temporary files

[cblp]

Temporary files are being regenerated often and polluting git status.

[ploxiln]

worth noting that these files are not present in the master branch, and may be intentionally kept in the maintenance 0.12 branch - ef22400

[cblp]

Yes, it may be something wrong with my build environment configuration.

[ploxiln]

This is probably autotools "maintainer mode". If you get the source extracted from the tarball, the modification times of the files are such that configure has the same timestamp as configure.ac, or newer, same for Makefile.in and Makefile.am etc. But if you clone/checkout from git, the files are created in an arbitrary order, and on a filesystem with better-than second precision, it's likely that one of these files will be older than the file it is derived from. Then autoconf etc. will try to re-generate it.

One fix for this is to touch all files with a specific timestamp argument so they all have the same modification time. I think the ./configure --disable-dependency-tracking option could also work.

[hawicz]

Yes, those files are intentionally added on release branches. Not merging this change.