Remove #![deny(unused_qualifications)]

It causes cargo_embargo to be unable to compile the crate.

Bug: http://b/339424309
Test: treehugger
Change-Id: I85d02896c303615da374627a8ef9d686d151dbf6
diff --git a/patches/unused_qualifications.patch b/patches/unused_qualifications.patch
new file mode 100644
index 0000000..02423a1
--- /dev/null
+++ b/patches/unused_qualifications.patch
@@ -0,0 +1,13 @@
+diff --git a/src/lib.rs b/src/lib.rs
+index f740fd5..df1db17 100644
+--- a/src/lib.rs
++++ b/src/lib.rs
+@@ -57,7 +57,7 @@
+ )]
+ // `#[derive(...)]` uses `trivial_numeric_casts` and `unused_qualifications`
+ // internally.
+-#![deny(missing_docs, unused_qualifications, variant_size_differences)]
++#![deny(missing_docs, variant_size_differences)]
+ #![forbid(unused_results)]
+ #![no_std]
+ 
diff --git a/src/lib.rs b/src/lib.rs
index f740fd5..df1db17 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -57,7 +57,7 @@
 )]
 // `#[derive(...)]` uses `trivial_numeric_casts` and `unused_qualifications`
 // internally.
-#![deny(missing_docs, unused_qualifications, variant_size_differences)]
+#![deny(missing_docs, variant_size_differences)]
 #![forbid(unused_results)]
 #![no_std]