include: Declare gVERSION global as 'extern'.

[besser82]

Fixes build with '-fno-common'.

[Propanu]

@besser82, I have no issues merging this to the project but you need to sign the ECA. Let us know if you need help with that.

[ffontaine]

It should be noted that this PR is needed to fix the build with gcc 10 (which defaults to -fno-common)

[tingleby]

Cool @besser82 could you please take a look at the ECA check which we require to pull this.

[tingleby]

@besser82 Could you please create an Eclipse account to sign/ack the ECA. Id like to merge this patch.

Before your contribution can be accepted by the project, you need to create and 
electronically sign the Eclipse Contributor Agreement (ECA) and sign 
off on the Eclipse Foundation Certificate of Origin. 

For more information, please visit

http://wiki.eclipse.org/Development_Resources/Contributing_via_Git

[jan-kiszka]

What's the status here? I'm also in need for fixing this (and did so locally before seeing this one).

[tingleby]

Merged, with aaa0a5c