misc/librepo: Fix missing symbol 'flistxattr'

flistxattr is a function from Linux's xattr API that isn't
available on FreeBSD and is mapped to FreeBSD syscalls.

flistxattr mapping was missing since some port update.

Reported by:	Rick Miller <vrwmiller@gmail.com>

misc/librepo/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	librepo
 DISTVERSION=	1.14.0
+PORTREVISION=	1
 CATEGORIES=	misc
 
 MAINTAINER=	yuri@FreeBSD.org

misc/librepo/files/xattr.c

@@ -10,6 +10,16 @@
 
 // code below is adopted and simplified from the 'xattr' python module https://github.com/xattr/xattr/blob/master/xattr/lib_build.c
 
+static void convert_bsd_list(char *namebuf, size_t size) {
+	size_t offset = 0;
+	while(offset < size) {
+		int length = (int) (unsigned char)namebuf[offset];
+		memmove(namebuf+offset, namebuf+offset+1, length);
+		namebuf[offset+length] = '\0';
+		offset += length+1;
+	}
+}
+
 int fsetxattr(int fd, const char *name, const void *value, size_t size, int flags) {
 	int rv = 0;
 
@@ -24,6 +34,17 @@ int fsetxattr(int fd, const char *name, const void *value, size_t size, int flag
 		return rv;
 }
 
+ssize_t flistxattr(int fd, char *namebuf, size_t size) {
+	ssize_t rv = 0;
+
+	rv = extattr_list_fd(fd, EXTATTR_NAMESPACE_USER, namebuf, size);
+
+	if (rv > 0 && namebuf)
+		convert_bsd_list(namebuf, rv);
+
+	return rv;
+}
+
 ssize_t fgetxattr(int fd, const char *name, void *value, size_t size) {
 	return extattr_get_fd(fd, EXTATTR_NAMESPACE_USER, name, value, size);
 }

misc/librepo/files/xattr.h

@@ -1,4 +1,5 @@
 
 int fsetxattr(int fd, const char *name, const void *value, size_t size, int flags);
+ssize_t flistxattr(int fd, char *namebuf, size_t size);
 ssize_t fgetxattr(int fd, const char *name, void *value, size_t size);
 int fremovexattr(int fd, const char *name);