distro: Bootstrap via a cross-toolchain.

This allows the final toolchain to be completely independent of
%BOOTSTRAP-INPUTS.

* distro/base.scm (glibc-dynamic-linker): New procedure.
  (gcc-4.7): Remove #:path-exclusions argument.  Check whether LIBC is
  #f before using it.
  (glibc): Remove "libc_cv_as_needed" hack.  Patch `Makeconfig' to
  remove `-lgcc_s'.
  (nix-system->gnu-triplet, boot-triplet): New variables.
  (binutils-boot0): Turn into a cross-Binutils targeting (boot-triplet
  SYSTEM).
  (gcc-boot0): Likewise.  Add configure options to make a smaller
  build.  Remove "binutils-source" from the input, and use
  BINUTILS-BOOT0 instead.
  (glibc-final): Cross-build using GCC-BOOT0 and BINUTILS-BOOT0.
  (gcc-boot0-wrapped): New variable.
  (%boot2-inputs): Use it.
  (m4-boot2, gmp-boot2, mpfr-boot2, mpc-boot2): Remove.
  (binutils-final): New variable.
  (gcc-final): Turn into a joint build with GMP/MPFR/MPC.  Use
  BINUTILS-FINAL.
  (%boot3-inputs): Adjust accordingly.
  (%boot4-inputs): Remove.
  (%final-inputs): Use %BOOT3-INPUTS.

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