libbacktrace: add support of PE/COFF

libbacktrace: add support of PE/COFF

libbacktrace/
2015-05-29  Tristan Gingold  <gingold@adacore.com>

	* pecoff.c: New file.
	* Makefile.am (FORMAT_FILES): Add pecoff.c and dependencies.
	* Makefile.in: Regenerate.
	* filetype.awk: Detect pecoff.
	* configure.ac: Define BACKTRACE_SUPPORTS_DATA on elf platforms.
	Add pecoff.
	* btest.c (test5): Test enabled only if BACKTRACE_SUPPORTS_DATA is
	true.
	* backtrace-supported.h.in (BACKTRACE_SUPPORTS_DATA): Define.
	* configure: Regenerate.
	* pecoff.c: New file.

From-SVN: r223859