Updated libgpg-error to 1.22.

Noteworthy changes in version 1.22 (2016-04-25) [C18/A18/R0)
-----------------------------------------------

* New functions and macros to to provide iconv(3) on Windows.

* Support for LeakSanitizer with the gpgrt_annotate_leaked_object
  inline function.

* Interface changes relative to the 1.21 release:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GPG_ERR_DB_CORRUPTED            NEW.
gpgrt_annotate_leaked_object    NEW inline func.
GPGRT_ENABLE_W32_ICONV_MACROS    NEW.
gpgrt_w32_iconv_open            NEW.
gpgrt_w32_iconv_close            NEW.
gpgrt_w32_iconv                  NEW.

(wiz)