common:w32: Fix gnupg_w32_set_errno.
* common/sysutils.c (gnupg_w32_set_errno): Return EC.
Cherry-pick master commit of:
	4c6b759368bcf19a13df07c5c6080765ecac28ca
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
 
common:w32: Fix gnupg_w32_set_errno. Tags None Subscribers None 
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