stats file now uses create_empty_tmp_file, breaks the umask

[afuruhed]

The stats files need to have the same umask as other files, when sharing the cache among users.
It is now created as a tmp file and renamed, without updating the file permission.
I'm not sure what the most proper fix is so reporting as an issue here instead of / before suggesting a patch.

I guess this commit is to blame:
commit fc61ca9
Author: Joel Rosdahl joel@rosdahl.net
Date: Sat Nov 15 13:16:40 2014 +0100

Improve temporary file creation functions and usage

[jrosdahl]

Same problems for .manifest files (and ccache.conf if "ccache -M" or "ccache -o" is used). fc61ca9 made the problem worse, but the first problematic commit is a07f46a.

[jrosdahl]

See also ccache's official bug tracker: https://bugzilla.samba.org/show_bug.cgi?id=10978.

[afuruhed]

Ok, thanks.

[jrosdahl]

Fixed in ccache v3.2.1.