libgpg-error: disable weak references to pthreads

Fix on-device build.

packages/libgpg-error/pthreads-no-weak.patch

@@ -0,0 +1,12 @@
+diff -uNr libgpg-error-1.36/m4/threadlib.m4 libgpg-error-1.36.mod/m4/threadlib.m4
+--- libgpg-error-1.36/m4/threadlib.m4	2016-11-12 21:02:56.000000000 +0200
++++ libgpg-error-1.36.mod/m4/threadlib.m4	2019-08-16 21:23:04.646225294 +0300
+@@ -213,8 +213,6 @@
+             [Define if the POSIX multithreading library can be used.])
+           if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then
+             if case "$gl_cv_have_weak" in *yes) true;; *) false;; esac; then
+-              AC_DEFINE([USE_POSIX_THREADS_WEAK], [1],
+-                [Define if references to the POSIX multithreading library should be made weak.])
+               LIBTHREAD=
+               LTLIBTHREAD=
+             fi