[CM] nrepl build error

[bil at ccrma.Stanford.EDU]

Thanks for the bug report.  I removed s7_integer_checked
from s7, but forgot I was using it in notcurses_s7.c.
So just remove the #if S7_MAIN and its #endif.

On the lint problem -- apparently nrepl.scm could not
find lint.scm -- I think the later reference to lint
needs to be wrapped in (when with-lint...).  I'll have
corrected versions up by tomorrow.