RPM build fix (reverted CI changes which will need to be un-reverted or made conditional) and vendor Rust dependencies to make builds much faster in any CI system.

zeroidc/vendor/itertools/src/group_map.rs

@@ -0,0 +1,32 @@
+#![cfg(feature = "use_std")]
+
+use std::collections::HashMap;
+use std::hash::Hash;
+use std::iter::Iterator;
+
+/// Return a `HashMap` of keys mapped to a list of their corresponding values.
+///
+/// See [`.into_group_map()`](crate::Itertools::into_group_map)
+/// for more information.
+pub fn into_group_map<I, K, V>(iter: I) -> HashMap<K, Vec<V>>
+    where I: Iterator<Item=(K, V)>,
+          K: Hash + Eq,
+{
+    let mut lookup = HashMap::new();
+
+    iter.for_each(|(key, val)| {
+        lookup.entry(key).or_insert_with(Vec::new).push(val);
+    });
+
+    lookup
+}
+
+pub fn into_group_map_by<I, K, V>(iter: I, f: impl Fn(&V) -> K) -> HashMap<K, Vec<V>>
+    where
+        I: Iterator<Item=V>,
+        K: Hash + Eq,
+{
+    into_group_map(
+        iter.map(|v| (f(&v), v))
+    )
+}