Use different way of fixing line ends

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

rust-ansi_term0.11.spec

@@ -59,7 +59,7 @@ which use "default" feature of "%{crate}" crate.
 
 %prep
 %autosetup -n %{crate}-%{version_no_tilde} -N
-find -type f -name '*.rs' -exec sed -i -e 's/\r//' "{}" \+
+grep -IUlr $'\r' | xargs sed -i 's/\r$//'
 %autopatch -p1
 %cargo_prep