.gitignore: vim swap files
Add a rule in the .gitignore to not keep vim swap files under version
control and remove one vim swap file, which was added by mistake.
Signed-off-by: 
Vincent Stehlé <vincent.stehle@arm.com>
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Add a rule in the .gitignore to not keep vim swap files under version
control and remove one vim swap file, which was added by mistake.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>