package/sscep: fix linking error

Apply the patch to fix the following build failure raised since the
addition of the package in commit
72fa60dc102679f51b228336ec38f5af78ff7646:

uclibc/sysroot/usr/lib/libc.a(getopt.os): in function `__GI_getopt':
getopt.c:(.text+0x598): multiple definition of `getopt'; src/getopt.o:getopt.c:(.text+0x0): first defined here

The patch has been submitted and accepted upstream to address this issue.

Fixes:
 - http://autobuild.buildroot.net/results/844c7dd79f69ef2ea8f293bb73a2d4b7533aa97c

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
[yann.morin.1998@free.fr: do an actual bacport]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/sscep/0001-Fix-getopt-linking-error.patch

@@ -0,0 +1,57 @@
+From 65561b53344b834877e6b63320066a1e26038a3c Mon Sep 17 00:00:00 2001
+From: Dario Binacchi <dario.binacchi@amarulasolutions.com>
+Date: Fri, 9 Dec 2022 18:18:27 +0100
+Subject: [PATCH] Fix getopt linking error
+
+The buildroot project, to which the sscep application was added, has
+configurations that raise the following linking error:
+buildroot/output/host/lib/gcc/arc-buildroot-linux-uclibc/11.3.0/../../../../arc-buildroot-linux-uclibc/bin/ld: buildroot/output/host/bin/../arc-buildroot-linux-uclibc/sysroot/usr/lib/libc.a(getopt.os):(.data+0x8): multiple definition of `optind'; src/getopt.o:(.data+0x0): first defined here
+buildroot/output/host/lib/gcc/arc-buildroot-linux-uclibc/11.3.0/../../../../arc-buildroot-linux-uclibc/bin/ld: buildroot/output/host/bin/../arc-buildroot-linux-uclibc/sysroot/usr/lib/libc.a(getopt.os): in function `__GI_getopt':
+getopt.c:(.text+0x5a4): multiple definition of `getopt'; src/getopt.o:getopt.c:(.text+0x0): first defined here
+buildroot/output/host/lib/gcc/arc-buildroot-linux-uclibc/11.3.0/../../../../arc-buildroot-linux-uclibc/bin/ld: buildroot/output/host/bin/../arc-buildroot-linux-uclibc/sysroot/usr/lib/libc.a(getopt.os): in function `getopt_long':
+getopt.c:(.text+0x5b0): multiple definition of `getopt_long'; src/getopt.o:getopt.c:(.text+0x128): first defined here
+collect2: error: ld returned 1 exit status
+make[2]: *** [Makefile:507: sscep] Error 1
+make[1]: *** [package/pkg-generic.mk:293: buildroot/output/build/sscep-0.10.0/.stamp_built] Error 2
+
+The patch re-added a check that commit
+81f56f635259b9 ("Replaced GNU getopt by a BSD licensed alternative")
+removed.
+
+Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
+[yann.morin.1998@free.fr: make that an actual backport]
+Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
+---
+ src/getopt.c | 12 ++++++++++++
+ 1 file changed, 12 insertions(+)
+
+diff --git a/src/getopt.c b/src/getopt.c
+index eae36a6..0109406 100644
+--- a/src/getopt.c
++++ b/src/getopt.c
+@@ -31,6 +31,16 @@
+ #include <stddef.h>
+ #include <string.h>
+ 
++#define GETOPT_INTERFACE_VERSION 2
++#if !defined _LIBC && defined __GLIBC__ && __GLIBC__ >= 2
++# include <gnu-versions.h>
++# if _GNU_GETOPT_INTERFACE_VERSION == GETOPT_INTERFACE_VERSION
++#  define ELIDE_CODE
++# endif
++#endif
++
++#ifndef ELIDE_CODE
++
+ char* optarg;
+ int optopt;
+ /* The variable optind [...] shall be initialized to 1 by the system. */
+@@ -226,3 +236,5 @@ int getopt_long(int argc, char* const argv[], const char* optstring,
+   ++optind;
+   return retval;
+ }
++
++#endif	/* Not ELIDE_CODE.  */
+-- 
+2.25.1
+