- Fix upstream urls

- Update URLs in the .spec file
- Update to version 3.7.1
- Changes for version 3.7.1
* Fixed a problem when using the compiler option `-MF /dev/null`.
* Long commandlines are now handled gracefully on Windows by using
the `@file` syntax to avoid hitting the commandline size limit.
* Fixed complaint from GCC 9’s `-Werror=format-overflow` when
compiling ccache itself.
- Changes for version 3.7
* Fixed crash when the debug mode is enabled and the output file is
in a non-writable directory, e.g. when the output file is `/dev/null`.
* Fixed an issue when printing very large log messages to the debug
log.
* Fixed bugs related to support for `-gsplit-dwarf`. Previously
ccache could produce an incorrect link to the `.dwo` file in the
`.o` file.
* Compilations with /dev/null as the input file are now cached.
* ccache has learned how to contruct the object filename if no `-o`
option is given and the source filename does not include a `.` or
ends with a `.`.
* Fixed a temporary file leak when the depend mode is enabled and
the compiler produces standard error output.
* Fixed a bug in the depend mode where a manifest hash only could
be associated with one set of header dependencies.
* Manifest files did not get marked as used on direct cache hits,
so the LRU cache cleanup would incorrectly remove them eventually.
This has been fixed.
* The rewriting of absolute paths into relative paths in the