package/libgpgme: fix build with glibc >= 2.34

Fix the following build failure with glibc >= 2.34:

posix-io.c: In function '_gpgme_io_spawn':
posix-io.c:577:23: error: void value not ignored as it ought to be
  577 |             while ((i = closefrom (fd)) && errno == EINTR)
      |                       ^

Fixes:
 - http://autobuild.buildroot.org/results/b11094ddd35263071b7dd453a6590c5b684026ff

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/libgpgme/0001-core-Support-closefrom-also-for-glibc.patch

@@ -0,0 +1,36 @@
+From 4b64774b6d13ffa4f59dddf947a97d61bcfa2f2e Mon Sep 17 00:00:00 2001
+From: Jiri Kucera <sanczes@gmail.com>
+Date: Sun, 25 Jul 2021 11:35:54 +0200
+Subject: [PATCH] core: Support closefrom also for glibc.
+
+* src/posix-io.c (_gpgme_io_spawn): Use glibc's closefrom.
+--
+
+Since 2.34, glibc introduces closefrom (the implementation
+follows *BSD standard).
+
+Signed-off-by: Werner Koch <wk@gnupg.org>
+
+[Retrieved from:
+https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gpgme.git;a=commit;h=4b64774b6d13ffa4f59dddf947a97d61bcfa2f2e]
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ src/posix-io.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/posix-io.c b/src/posix-io.c
+index e712ef28..2a3a81fc 100644
+--- a/src/posix-io.c
++++ b/src/posix-io.c
+@@ -570,7 +570,7 @@ _gpgme_io_spawn (const char *path, char *const argv[], unsigned int flags,
+               if (fd_list[i].fd > fd)
+                 fd = fd_list[i].fd;
+             fd++;
+-#if defined(__sun) || defined(__FreeBSD__)
++#if defined(__sun) || defined(__FreeBSD__) || defined(__GLIBC__)
+             closefrom (fd);
+             max_fds = fd;
+ #else /*!__sun */
+-- 
+2.11.0
+