Contribs: don't build gpg-error executable

contrib/src/gpg-error/no-executable.patch

+--- libgpg-error/Makefile.am.orig	2015-05-05 16:59:07.513558034 +0200
++++ libgpg-error/Makefile.am	2015-05-05 16:59:18.150414495 +0200
+@@ -39,7 +39,7 @@
+ doc =
+ endif
+ 
+-SUBDIRS = m4 src $(doc) tests po $(lang_subdirs)
++SUBDIRS = m4 src $(doc) $(lang_subdirs)
+ 
+ 
+ dist-hook: gen-ChangeLog
+--- libgpg-error/src/Makefile.am.orig	2014-10-25 14:42:43.000000000 +0200
++++ libgpg-error/src/Makefile.am	2015-05-05 16:59:40.887486960 +0200
+@@ -31,7 +31,7 @@
+ 
+ localedir = $(datadir)/locale
+ 
+-bin_PROGRAMS = gpg-error
++bin_PROGRAMS = 
+ 
+ if HAVE_W32_SYSTEM
+ noinst_PROGRAMS = gen-w32-lock-obj

contrib/src/gpg-error/rules.mak

@@ -13,6 +13,7 @@ ifdef HAVE_WIN32
 	$(APPLY) $(SRC)/gpg-error/windres-make.patch
 endif
 	$(APPLY) $(SRC)/gpg-error/missing-unistd-include.patch
+	$(APPLY) $(SRC)/gpg-error/no-executable.patch
 	$(MOVE)
 	cp $@/src/syscfg/lock-obj-pub.arm-unknown-linux-androideabi.h $@/src/syscfg/lock-obj-pub.linux-android.h
 ifdef HAVE_IOS