Move almost all run-make-fulldeps to run-make

They pass fine.

tests/run-make/sepcomp-separate/foo.rs

@@ -0,0 +1,21 @@
+fn magic_fn() -> usize {
+    1234
+}
+
+mod a {
+    pub fn magic_fn() -> usize {
+        2345
+    }
+}
+
+mod b {
+    pub fn magic_fn() -> usize {
+        3456
+    }
+}
+
+fn main() {
+    magic_fn();
+    a::magic_fn();
+    b::magic_fn();
+}