mdns: Do not include nss.h with musl

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>

meta-networking/recipes-protocols/mdns/files/0001-nss_mdns-Do-not-include-nss.h-when-libc-glibc.patch

@@ -0,0 +1,42 @@
+From d3082d2c606c810aa0a39378bf1e02575af3a301 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Fri, 2 Feb 2018 21:54:11 -0800
+Subject: [PATCH] nss_mdns: Do not include nss.h when libc != glibc
+
+Provide nss_status macro instead for non-glibc case
+where nss.h is absent
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ mDNSPosix/nss_mdns.c | 13 ++++++++++++-
+ 1 file changed, 12 insertions(+), 1 deletion(-)
+
+diff --git a/mDNSPosix/nss_mdns.c b/mDNSPosix/nss_mdns.c
+index afadb3c..c469584 100755
+--- a/mDNSPosix/nss_mdns.c
++++ b/mDNSPosix/nss_mdns.c
+@@ -378,8 +378,19 @@ init_config ();
+ 
+ #define ENTNAME  hostent
+ #define DATABASE "hosts"
+-
++#ifdef __GLIBC__
+ #include <nss.h>
++#else
++enum nss_status
++{
++    NSS_STATUS_TRYAGAIN = -2,
++    NSS_STATUS_UNAVAIL,
++    NSS_STATUS_NOTFOUND,
++    NSS_STATUS_SUCCESS,
++    NSS_STATUS_RETURN
++};
++#define NETDB_INTERNAL NULL
++#endif
+ // For nss_status
+ #include <netdb.h>
+ // For hostent
+-- 
+2.16.1
+

meta-networking/recipes-protocols/mdns/mdns_765.50.9.bb

@@ -9,6 +9,7 @@ RPROVIDES_${PN} += "libdns_sd.so"
 SRC_URI = "http://opensource.apple.com/tarballs/mDNSResponder/mDNSResponder-${PV}.tar.gz \
            file://build.patch;patchdir=.. \
            file://mdns.service \
+           file://0001-nss_mdns-Do-not-include-nss.h-when-libc-glibc.patch;patchdir=.. \
            "
 
 SRC_URI[md5sum] = "4a6bc1628851002634ea3833a4dca317"