Update to 1.59:

2014/06/05 (diffstat 1.59)
	+ add -E option to filter escape-sequences, e.g., from colordiff
	  (Ubuntu #1304262).

	+ merge/adapt improvments to makefile and configure script from
	  openembedded.org (forwarded by Ross Burton).
	  + remove unused $(libdir) from makefile "installdirs" target
	  + amend definition in CF_POPEN_TEST to permit use of autoheader.
	  + workaround for gratuitous renaming of AC_ACVERSION in 2.69

	+ added "docs" rule to makefile

	+ improvements to configure macros:
	  + added check for -Wlogical-op to gcc warnings
	  + suppress check for defining _XOPEN_SOURCE on Solaris
	  + trim an unwanted -no-gcc option for Intel compiler

	+ update config.guess, config.sub

2013/10/28 (diffstat 1.58)
	+ add COPYING file (request by Dagobert Michelsen).

	+ improved portability for cross-compiling, by supplying missing
	  getopt function as well as improving checks for popen/pclose
	  prototypes.

	+ updated configure macros, e.g., for MingW and MSYS fixes.

	+ update config.guess, config.sub

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