core: Add helper functions for attrs versions

These functions make it easier to compare against known OpenGL and
OpenGLES versions since all known and expected future versions have a
minor version <= 9.

For example, to check that the attrs struct has a version >= 3.2, use
wcore_config_attrs_version_ge(attrs, 32)

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
core: Stop using attrs->context_full_version

If the user makes a request to waffle for a minor version > 9, then
this field will not properly represent the requested version.

Although, such a request from the user would likely be invalid, we
should handle it properly.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
core: Remove attrs->context_full_version

If the user makes a request to waffle for a minor version > 9, then
this field will not properly represent the requested version.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>