Silence almost all warnings when compiling coretests

Author: bjorn3

patches/0022-sysroot-Disable-not-compiling-tests.patch

@@ -31,5 +31,14 @@ index 0000000..46fd999
 +[dependencies]
 +rand = { version = "0.8.5", default-features = false }
 +rand_xorshift = { version = "0.3.0", default-features = false }
+diff --git a/library/core/tests/lib.rs b/library/core/tests/lib.rs
+index 42a26ae..5ac1042 100644
+--- a/library/core/tests/lib.rs
++++ b/library/core/tests/lib.rs
+@@ -1,3 +1,4 @@
++#![cfg(test)]
+ #![feature(alloc_layout_extra)]
+ #![feature(array_chunks)]
+ #![feature(array_methods)]
 --
 2.21.0 (Apple Git-122)