Postfix: enable build on musl

srcpkgs/postfix/patches/fix-building-on-musl.patch

@@ -0,0 +1,13 @@
+diff --git src/util/sys_defs.h src/util/sys_defs.h
+index 5b381af..416676e 100644
+--- src/util/sys_defs.h
++++ src/util/sys_defs.h
+@@ -812,7 +812,7 @@ extern int initgroups(const char *, int);
+ #define KERNEL_VERSION(a,b,c) (LINUX_VERSION_CODE + 1)
+ #endif
+ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,2,0)) \
+-	|| (__GLIBC__ < 2)
++	|| (defined(__GLIBC__) && (__GLIBC__ < 2))
+ #define CANT_USE_SEND_RECV_MSG
+ #define DEF_SMTP_CACHE_DEMAND	0
+ #else

srcpkgs/postfix/template

@@ -1,7 +1,7 @@
 # Template file for 'postfix'
 pkgname=postfix
 version=3.0.3
-revision=2
+revision=3
 short_desc="High-performance mail transport agent"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
 license="IBM Public License 1.0, BSD-alike"
@@ -18,6 +18,10 @@ if [ "$CROSS_BUILD" ]; then
 	hostmakedepends+=" ${pkgname}"
 fi
 
+case "${XBPS_TARGET_MACHINE}" in
+	*-musl) CFLAGS+=" -DNO_NIS" ;;
+esac
+
 system_accounts="postfix"
 postfix_homedir="/var/spool/postfix"
 system_groups="postdrop"