[Buildroot] <package>_VER vs <package>_VERSION

[Ulf Samuelsson]

Some packages use <package>_VER  and some use  <package>_VERSION
and some does not use this at all and hardcodes the version.

Suggest we clean this up so we use a single template.

Suggest we do it using the following template, allowing user to override.

ifeq    ($(<package>_VERSION),)
<package>_VERSION:=X.Y.Z
endif

Best Regards
Ulf Samuelsson