[toplevel PATCH] Bootstrappable target modules

[Paolo Bonzini]

This patch allows for bootstrappable target modules; I tested it by 
making libada temporarily a bootstrap module.

No changes in the generated Makefile.in, except because of this hunk:

@@ -1340,7 +1340,7 @@ stage[+id+]-start::
        @[ -f stage_current ] && $(MAKE) `cat stage_current`-end || : ; \
        echo stage[+id+] > stage_current ; \
        echo stage[+id+] > stage_last; \
-       $(SHELL) $(srcdir)/mkinstalldirs $(HOST_SUBDIR)[+
+       $(SHELL) $(srcdir)/mkinstalldirs $(HOST_SUBDIR) $(TARGET_SUBDIR)[+
    FOR host_modules +][+ IF bootstrap +]

Ok for gcc and src?

Paolo
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