Remove some tests from nr2 exclusion file

Those test are now passing.

gcc/testsuite/ChangeLog:

	* rust/compile/nr2/exclude: Remove passing tests.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

gcc/testsuite/rust/compile/nr2/exclude

@@ -8,18 +8,13 @@ macros/builtin/include3.rs
 macros/builtin/include4.rs
 canonical_paths1.rs
 cfg1.rs
-cfg3.rs
-cfg4.rs
-cfg5.rs
 closure_no_type_anno.rs
 complex-path1.rs
 complex_qualified_path_in_expr.rs
 const-issue1440.rs
 const_generics_3.rs
 const_generics_4.rs
-const_generics_5.rs
 const_generics_7.rs
-derive_empty.rs
 derive_macro1.rs
 derive_macro3.rs
 derive_macro4.rs
@@ -69,7 +64,6 @@ issue-2070.rs
 issue-2105.rs
 issue-2135.rs
 issue-2136-1.rs
-issue-2136-2.rs
 issue-2139.rs
 issue-2142.rs
 issue-2165.rs
@@ -93,16 +87,13 @@ iterators1.rs
 lookup_err1.rs
 macros/mbe/macro-issue1233.rs
 macros/mbe/macro-issue1400.rs
-macros/mbe/macro13.rs
-macros/mbe/macro15.rs
 macros/mbe/macro23.rs
 macros/mbe/macro40.rs
 macros/mbe/macro43.rs
 macros/mbe/macro44.rs
 macros/mbe/macro50.rs
 macros/mbe/macro54.rs
 macros/mbe/macro6.rs
-macros/mbe/macro_rules_macro_rules.rs
 macros/mbe/macro_use1.rs
 match-never-ltype.rs
 match-never-rtype.rs
@@ -143,7 +134,6 @@ redef_error2.rs
 redef_error4.rs
 redef_error5.rs
 redef_error6.rs
-self-path1.rs
 self-path2.rs
 sizeof-stray-infer-var-bug.rs
 stmt_with_block_dot.rs