* Makefile.in : allow installation as non-root user, print out
  some debugging information before running test suite.
* summary.c : allow compilation without USE_DEMANGLE
* sysdeps/linux-gnu/ppc/plt.c : fix warning in sym2addr
* sysdeps/linux-gnu/ia64/regs.c : fix warning when finding
  instruction slot
* elf.c : fix up error created in 2006-07-26 refactor