libsensors soname bump

[Jean Delvare <jdelvare@suse.de>]

Hi Ondřej,

You have recently released lm-sensors 3.5.0 with a new soname for
libsensors:

-LIBMAINVER := 4
-LIBMINORVER := 4.0
+LIBMAINVER := 5
+LIBMINORVER := 0.0

-#define SENSORS_API_VERSION            0x440
+#define SENSORS_API_VERSION            0x500

This is declaring the new library as incompatible with the previous
version, meaning that distributions will have to build and ship both
libsensors4 and libsensors5 for a long time until all applications have
been updated and rebuilt to link with the new library. This is a
significant effort for the whole community and should only be done when
necessary.

In this specific case, I can't see what warranted such a change of
major library version change. From
lm-sensors/doc/developers/release_checklist:

  Remember: update main number when interface changes, minor if new
  functionality is added, and patch if only bugs are fixed.

In this case I can only see new functionality added, there is no
interface change. Therefore the correct value for SENSORS_API_VERSION
was 0x450, not 0x500. This would avoid the parallel maintenance and
installation of 2 versions of the library for several years to come.

Would you consider quickly releasing lm-sensors 3.5.1 with the proper
library version number, to save all that work to all application
authors/maintainers and distribution package maintainers?

Thanks,
-- 
Jean Delvare
SUSE L3 Support