Bootstrapping sparc-sun-solaris2.5.1 - missing rules for some .o files in libio

[Jim Wilson]

	OK, I just checked, and it's actually Solaris' make program to blame!

This is curious, but it does make sense.

The reason I say it is curious is because some of the people reporting the
problem did report that there were using GNU make.  However, now that I
think of it, I think those people were invoking it as `gmake'.  So perhaps
the problem is that somewhere we were accidentally using `make' for a
recursive invocation when we should have used ${MAKE}.  Or perhaps somewhere
a configure script invoked make and ${MAKE} hadn't been set yet.

Jim