Here in ppsi,

  ./MAKEALL wrpc_defconfig wrpc_pdelay_defconfig

shows a very small difference, but most pdelay code is then
discarded by the wrpc-sw link time, due to --gc-sections.
This is the result:

   laptopo% ./MAKEALL spec_defconfig spec_pdelay_defconfig
   ##### Building with 'spec_defconfig'
   /opt/lm32-gcc-4.5.3/bin/lm32-elf-ar: creating libsdbfs.a
      text    data     bss     dec     hex filename
     87688    3492    6352   97532   17cfc wrc.elf
   ##### Building with 'spec_pdelay_defconfig'
   /opt/lm32-gcc-4.5.3/bin/lm32-elf-ar: creating libsdbfs.a
      text    data     bss     dec     hex filename
     93140    3492    6360  102992   19250 wrc.elf

What is missing now is the run-time choice between e2e and p2p. Later....
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>