update rust toolchain

It comes with a bunch of new lints (yay!) so I fixed them all so CI will
keep working.

Also apparently something about linking changed because I had to change
the checks for deciding the linker flags for static x86_64 builds to
keep working.

src/database/abstraction/sqlite.rs

@@ -33,7 +33,7 @@ impl Iterator for PreparedStatementIterator<'_> {
 struct NonAliasingBox<T>(*mut T);
 impl<T> Drop for NonAliasingBox<T> {
     fn drop(&mut self) {
-        unsafe { Box::from_raw(self.0) };
+        drop(unsafe { Box::from_raw(self.0) });
     }
 }