put builddir/include before srcdir/include in -...
put builddir/include before srcdir/include in -...

put builddir/include before srcdir/include in -I

This isn't required, but it may avoid some crazy problems
such as https://svn.open-mpi.org/trac/ompi/ticket/3017
when a spurious config.h somehow exists in srcdir.

This commit was SVN r4319.

shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc