Enhance objdump's --private option so that it can display the contents of PE format...

Enhance objdump's --private option so that it can display the contents of PE format files.

  * od-pe.c: New file: Dumps fields in PE format headers.
  * configure.ac (od_vectors): Add objdump_private_desc_pe for PE format targets. (od_files): Add od-pe for PE format targets.
  * configure: Regenerate.
  * Makefile.am (CFILES): Add od-pe.c (EXTRA_objdump_SOURCE): Likewise.
  * Makefile.in: Generate.
  * NEWS: Mention the new feature.
  * doc/binutils.texi: Document the new support.
  * objdump.c (wide_output): Change from local to global.
  * objdump.h (wide_output): Prototype. (objdump_private_desc_pe): Prototype.
  * testsuite/binutils-all/objdump.exp: Add a test of the new feature.