Rename t7636-neg.check to the standard t7636.check.

Not sure which partest bug allowed this, but the old name was wrong.
Merge pull request #2782 from adriaanm/fixup-7636

Rename t7636-neg.check to the standard t7636.check.
Merge remote-tracking branch 'scala/2.10.x' into merge-2.10.x