New patchwork state: Invalid

[Siddhesh Poyarekar]

Hi,

Adhemerval, Florian and I noticed a couple of manpage patches during 
review that managed to apply to the glibc tree because they only added 
new files and as a result, didn't fail CI.  I've added a new terminal 
state 'Invalid' to patchwork to mark such patches from now on.  It 
should be used for any patches that don't belong to glibc, e.g. because 
they've been cross-posted.

This is now separate from the 'Fails to apply' state, which was 
previously overloaded to indicate non-glibc patches.

Thanks,
Sid