Fixup for previous id change

The previous commit went to far. While the precomp ids may not depend on the
ever changing id of this repo, they still have to depend on the changing ids of
the repos down the chain.

src/core/CompUnit/Repository/Installation.pm

@@ -86,6 +86,12 @@ sub MAIN(:$name, :$auth, :$ver, *@, *%) {
         $lookup.close;
     }
 
+    method !precomp-id(Str $name) {
+        my $id = $name ~ self.path-spec;
+        $id ~= ',' ~ self.next-repo.id if self.next-repo;
+        nqp::sha1($id)
+    }
+
     method install(:$dist!, *@files) {
         $!lock.protect( {
         my $path     = self.writeable-path or die "No writeable path found";
@@ -122,7 +128,7 @@ sub MAIN(:$name, :$auth, :$ver, *@, *%) {
         my $has-provides;
         for @files -> $file is copy {
             $file = $is-win ?? ~$file.subst('\\', '/', :g) !! ~$file;
-            my $id = nqp::sha1($file ~ self.prefix);
+            my $id = self!precomp-id($file);
             my $destination = $sources-dir.child($id);
             if [||] @provides>>.ACCEPTS($file) -> $/ {
                 my $name = $/.ast;
@@ -165,7 +171,7 @@ sub MAIN(:$name, :$auth, :$ver, *@, *%) {
         for $d.provides.values.map(*.values[0]<file>) -> $file-id {
             my $source = $sources-dir.child($file-id);
             if $precomp.may-precomp {
-                my $id = nqp::sha1($source ~ self.prefix);
+                my $id = self!precomp-id($source.Str);
                 my $rev-deps-file = ($precomp.store.path($*PERL.compiler.id, $id) ~ '.rev-deps').IO;
                 my @rev-deps = $rev-deps-file.e ?? $rev-deps-file.lines !! ();
 
@@ -239,7 +245,7 @@ sub MAIN(:$name, :$auth, :$ver, *@, *%) {
                     );
                     my $handle;
                     if $precomp.may-precomp {
-                        my $id = nqp::sha1($loader ~ self.prefix);
+                        my $id = self!precomp-id($loader.Str);
                         if $*W and $*W.is_precompilation_mode {
                             say $id;
                             $handle = $precomp.load($id) or $precomp.precompile($loader, $id);