package/rpm: fix build issue with musl

Since the bump of rpm from 4.17.0 to 4.18.0 in Buildroot commit
4b4046e919, tools/rpmuncompress.c uses
basename() without including <libgen.h> which causes a build failure
with the musl C library:

tools/rpmuncompress.c: In function ‘doUntar’:
tools/rpmuncompress.c:100:30: error: implicit declaration of function ‘basename’ [-Wimplicit-function-declaration]
  100 |             const char *bn = basename(fn);
      |                              ^~~~~~~~
tools/rpmuncompress.c:100:30: error: initialization of ‘const char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
make[4]: *** [Makefile:1082: tools/rpmuncompress.o] Error 1

This issue was not found by the autobuilders, but it can be reproduced
with:

BR2_arm=y
BR2_cortex_a9=y
BR2_ARM_ENABLE_VFP=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV7_EABIHF_MUSL_BLEEDING_EDGE=y
BR2_PACKAGE_LUA=y
BR2_PACKAGE_RPM=y

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/rpm/0003-Fix-missing-basename-include-on-macOS.patch

@@ -0,0 +1,26 @@
+From f510770a214bd2e8144a39868c34cd568179599e Mon Sep 17 00:00:00 2001
+From: Calvin Buckley <calvin@cmpct.info>
+Date: Tue, 11 Jul 2023 19:22:41 -0300
+Subject: [PATCH] Fix missing basename include on macOS
+
+Upstream: b2e67642fd8cb64d8cb1cca9e759396c1c10807d
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ tools/rpmuncompress.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/tools/rpmuncompress.c b/tools/rpmuncompress.c
+index bd4146d54..58ddf5683 100644
+--- a/tools/rpmuncompress.c
++++ b/tools/rpmuncompress.c
+@@ -1,6 +1,7 @@
+ #include "system.h"
+ 
+ #include <popt.h>
++#include <libgen.h>
+ #include <errno.h>
+ #include <stdio.h>
+ #include <string.h>
+-- 
+2.49.0
+