Make incr. comp. test case dependent on specific ICH instead of SVH

Author: michaelwoerister

src/test/incremental/remapped_paths_cc/auxiliary/extern_crate.rs

@@ -10,10 +10,9 @@
 
 // ignore-tidy-linelength
 
-// aux-build:extern_crate.rs
-//[rpass1] compile-flags: -g
-//[rpass2] compile-flags: -g
-//[rpass3] compile-flags: -g -Zremap-path-prefix-from={{src-base}} -Zremap-path-prefix-to=/the/src
+//[rpass1] compile-flags: -g -Zincremental-cc
+//[rpass2] compile-flags: -g -Zincremental-cc
+//[rpass3] compile-flags: -g -Zincremental-cc -Zremap-path-prefix-from={{src-base}} -Zremap-path-prefix-to=/the/src
 
 #![feature(rustc_attrs)]
 #![crate_type="rlib"]

src/test/incremental/remapped_paths_cc/main.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // revisions:rpass1 rpass2 rpass3
-// compile-flags: -Z query-dep-graph -g
+// compile-flags: -Z query-dep-graph -g -Zincremental-cc
 // aux-build:extern_crate.rs