Renumbered tests to match the order in app. J.
Another check for restrict abuses.
Consolidated positive tests.
Invalid tests.
More test reorganization.
Test fix.
Added check for qualified void & cleaned errors.
Two more test fixes.

Stuff I screwed up when consolidating the positive (i.e., expected pass) test
cases.
Check for out-of-range pointer difference.
Some new tests.
Fix issue with function type compatibility.
Some more tests.
Detect return from a _Noreturn function.
Fix for regression w/function return.
Check for tentative defs with internal linkage.
Tests for 87, 89.
Cleaned up a couple errors.
84, 86.
Catch decl with incomplete type and no linkage.
39, 45, 59, 67, 80.