incr.comp.: Move macro-export test case to src/test/incremental.

Author: michaelwoerister

src/test/compile-fail/incr_comp_with_macro_export.rs renamed to src/test/incremental/macro_export.rs

@@ -8,10 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// compile-flags: -Zincremental=tmp/cfail-tests/incr_comp_with_macro_export
+// revisions: cfail1 cfail2 cfail3
 // must-compile-successfully
 
-
 // This test case makes sure that we can compile with incremental compilation
 // enabled when there are macros exported from this crate. (See #37756)