non-recursive make in lib/, too

[Jim Meyering]

Here are three patches that extend coreutils' non-recursive
build into lib/, too.  With these, "make distcheck" still passes:

 Makefile.am                                   |   10 -
 bootstrap.conf                                |    5
 configure.ac                                  |    1
 gl/build-aux/prefix-gnulib-mk                 |  238 ++++++++++++++++++++++++++
 gl/m4/non-recursive-gnulib-prefix-hack.m4     |   29 +++
 gl/modules/non-recursive-gnulib-prefix-hack   |   25 ++
 lib/local.mk                                  |    5
 src/local.mk                                  |    6
 gl/build-aux/prefix-gnulib-mk                 |    3
 gl/m4/non-recursive-gnulib-prefix-hack.m4     |    6
 lib/Makefile.am                               |   37 ----

My only question is what happens when we actually use alloca.o,
i.e., see the FIXME comment in the log for c-set 2/3.
At worst, the fix-up code adds an extra "lib/" prefix,
and I'll remove it if/when someone reports the problem.

I will push something like this tomorrow.

k
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