package/libnpth: fix musl build

Fix the following musl build failure raised since bump to version 1.7 in
commit 3ef4d24192 and
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=npth.git;a=commit;h=575573b5b63e147b1906240f192dbe37a26ca4b9:

npth.c:392:21: error: unknown type name 'npth_rwlock_t'; did you mean 'npth_cond_t'?
  392 | npth_rwlock_rdlock (npth_rwlock_t *rwlock)
      |                     ^~~~~~~~~~~~~
      |                     npth_cond_t

Fixes: 3ef4d24192
 - http://autobuild.buildroot.org/results/d986ba27b734679fd70b4e0f23278ebd38e13c5d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libnpth/0001-Fix-INSERT_EXPOSE_RWLOCK_API-for-musl-C-library.patch

@@ -0,0 +1,37 @@
+From 417abd56fd7bf45cd4948414050615cb1ad59134 Mon Sep 17 00:00:00 2001
+From: NIIBE Yutaka <gniibe@fsij.org>
+Date: Fri, 1 Mar 2024 13:53:52 +0900
+Subject: [PATCH] Fix INSERT_EXPOSE_RWLOCK_API for musl C library.
+
+* configure.ac: Add a case for musl system.
+
+--
+
+GnuPG-bug-id: 5664
+Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
+
+Upstream: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=npth.git;a=commit;h=417abd56fd7bf45cd4948414050615cb1ad59134
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ configure.ac | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index c1091b1..576a26e 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -381,7 +381,10 @@ fi
+ AC_SUBST(INSERT_NO_RWLOCK)
+ 
+ case "${host}" in
+-    *-*-linux*|*-*-gnu*)
++    *-*-linux-musl*)
++        INSERT_EXPOSE_RWLOCK_API="1"
++        ;;
++    *-*-linux-gnu*|*-*-gnu*)
+         INSERT_EXPOSE_RWLOCK_API="defined(__USE_UNIX98) || defined(__USE_XOPEN2K)"
+         ;;
+     *)
+-- 
+2.30.2
+

package/libnpth/libnpth.mk

@@ -10,5 +10,7 @@ LIBNPTH_SITE = https://www.gnupg.org/ftp/gcrypt/npth
 LIBNPTH_LICENSE = LGPL-2.0+
 LIBNPTH_LICENSE_FILES = COPYING.LIB
 LIBNPTH_INSTALL_STAGING = YES
+# 0001-Fix-INSERT_EXPOSE_RWLOCK_API-for-musl-C-library.patch
+LIBNPTH_AUTORECONF = YES
 
 $(eval $(autotools-package))