package/alsa-lib: fix musl build

Buildroot commit 227d414ded bumped alsa-lib to version 1.2.10 which
introduced a build error with musl toolchains.

Fixes:
http://autobuild.buildroot.net/results/bce/bce46fd8aab9ef4918228e8cfc5f8b5abe71e859/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/alsa-lib/0002-global-h-move-__STRING-macro-outside-PIC-ifdef-block.patch

@@ -0,0 +1,50 @@
+From 10bd599970acc71c92f85eb08943eb8d3d702a9c Mon Sep 17 00:00:00 2001
+From: Jaroslav Kysela <perex@perex.cz>
+Date: Wed, 6 Sep 2023 15:16:44 +0200
+Subject: [PATCH] global.h: move __STRING() macro outside !PIC ifdef block
+
+It solves the musl libc compilation issue.
+
+control.c: In function 'snd_ctl_open_conf':
+../../include/global.h:98:36: warning: implicit declaration of function '__STRING' [-Wimplicit-function-declaratio]
+   98 | #define SND_DLSYM_VERSION(version) __STRING(version)
+      |                                    ^~~~~~~~
+
+Fixes: https://github.com/alsa-project/alsa-lib/issues/350
+Signed-off-by: Jaroslav Kysela <perex@perex.cz>
+
+Upstream: https://github.com/alsa-project/alsa-lib/commit/10bd599970acc71c92f85eb08943eb8d3d702a9c
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ include/global.h | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/include/global.h b/include/global.h
+index dfe9bc2b..3ecaeee8 100644
+--- a/include/global.h
++++ b/include/global.h
+@@ -51,6 +51,11 @@ const char *snd_asoundlib_version(void);
+ #define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+ #endif
+ 
++#ifndef __STRING
++/** \brief Return 'x' argument as string */
++#define __STRING(x)     #x
++#endif
++
+ #ifdef PIC /* dynamic build */
+ 
+ /** \hideinitializer \brief Helper macro for #SND_DLSYM_BUILD_VERSION. */
+@@ -71,11 +76,6 @@ struct snd_dlsym_link {
+ 
+ extern struct snd_dlsym_link *snd_dlsym_start;
+ 
+-#ifndef __STRING
+-/** \brief Return 'x' argument as string */
+-#define __STRING(x)     #x
+-#endif
+-
+ /** \hideinitializer \brief Helper macro for #SND_DLSYM_BUILD_VERSION. */
+ #define __SND_DLSYM_VERSION(prefix, name, version) _ ## prefix ## name ## version
+ /**