contrib/gpg-error: fix compilation for embedded 64bit Darwin platforms

contrib/src/gpg-error/missing-unistd-include.patch

+diff -ru libgpg-error/tests/t-lock.c libgpg-error-fixed/tests/t-lock.c
+--- libgpg-error/tests/t-lock.c	2014-01-24 21:50:09.000000000 +0100
++++ libgpg-error-fixed/tests/t-lock.c	2014-08-17 22:10:24.000000000 +0200
+@@ -24,6 +24,7 @@
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
++#include <unistd.h>
+ #include <assert.h>
+ #ifdef _WIN32
+ # include <windows.h>

contrib/src/gpg-error/rules.mak

@@ -12,6 +12,7 @@ libgpg-error: libgpg-error-$(GPGERROR_VERSION).tar.bz2 .sum-gpg-error
 ifdef HAVE_WIN32
 	$(APPLY) $(SRC)/gpg-error/windres-make.patch
 endif
+	$(APPLY) $(SRC)/gpg-error/missing-unistd-include.patch
 	$(MOVE)
 	cp $@/src/syscfg/lock-obj-pub.arm-unknown-linux-androideabi.h $@/src/syscfg/lock-obj-pub.linux-android.h
 ifdef HAVE_IOS