* gnu/packages/c.scm (cproc)[arguments]: Add phase to set glibc dir.
[arguments]: Properly specify program inputs in 'configure phase.
* gnu/packages/patches/cproc-extra-linkflags.patch: New patch.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>