libnfc: fix musl.

srcpkgs/libnfc/patches/fix-musl.patch

@@ -0,0 +1,10 @@
+--- libnfc/buses/spi.c.orig	2015-09-02 23:53:39.609374047 +0200
++++ libnfc/buses/spi.c	2015-09-02 23:53:44.994373644 +0200
+@@ -51,6 +51,7 @@
+ #include <stdio.h>
+ #include <termios.h>
+ #include <unistd.h>
++#include <asm/ioctl.h>
+ 
+ #include <nfc/nfc.h>
+ #include "nfc-internal.h"

srcpkgs/libnfc/template

@@ -1,7 +1,7 @@
 # Template file for 'libnfc'
 pkgname=libnfc
 version=1.7.1
-revision=1
+revision=2
 wrksrc="${pkgname}-${pkgname}-${version}"
 build_style=cmake
 short_desc="Low level NFC SDK and Programmers API"
@@ -12,6 +12,7 @@ license="GPL-3"
 homepage="http://nfc-tools.org/"
 distfiles="https://github.com/nfc-tools/libnfc/archive/libnfc-${version}.tar.gz"
 checksum=30de35b4f1af3f57dab40d91ffb2275664a35859ff2b014ba7b226aa3f5465f5
+CFLAGS="-D_GNU_SOURCE"
 
 pre_configure() {
 	sed -i "s|MODE=\"0664\", GROUP=\"plugdev\"|TAG+=\"uaccess\"|g" contrib/udev/42-pn53x.rules