Don't suggest macros that out of scope

src/test/ui/issues/issue-11692-2.stderr

@@ -3,9 +3,6 @@ error: cannot find macro `test` in this scope
    |
 LL |     concat!(test!());
    |             ^^^^
-   |
-   = note: consider importing this attribute macro:
-           std::prelude::v1::test
 
 error: aborting due to previous error
 

src/test/ui/proc-macro/derive-helper-shadowing.stderr

@@ -16,8 +16,6 @@ error: cannot find attribute `empty_helper` in this scope
 LL |             #[derive(GenHelperUse)]
    |                      ^^^^^^^^^^^^
    |
-   = note: consider importing this attribute macro:
-           empty_helper
    = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: cannot find attribute `empty_helper` in this scope
@@ -29,8 +27,6 @@ LL |         #[empty_helper]
 LL |             gen_helper_use!();
    |             ------------------ in this macro invocation
    |
-   = note: consider importing this attribute macro:
-           crate::empty_helper
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0659]: `empty_helper` is ambiguous (name vs any other name during import resolution)

src/test/ui/proc-macro/macro-namespace-reserved-2.stderr

@@ -93,18 +93,12 @@ error: cannot find macro `my_macro_attr` in this scope
    |
 LL |     my_macro_attr!();
    |     ^^^^^^^^^^^^^
-   |
-   = note: consider importing this attribute macro:
-           my_macro_attr
 
 error: cannot find macro `MyTrait` in this scope
   --> $DIR/macro-namespace-reserved-2.rs:33:5
    |
 LL |     MyTrait!();
    |     ^^^^^^^
-   |
-   = note: consider importing this derive macro:
-           MyTrait
 
 error: cannot find attribute `my_macro` in this scope
   --> $DIR/macro-namespace-reserved-2.rs:38:3