[gnome-multi-writer] build: add missing gio-unix-2.0 dependency

[Richard Hughes <rhughes src gnome org>]

commit 5269a25199cd6b6847c5d46c511ec8dd5c12d572
Author: Jan Tojnar <jtojnar gmail com>
Date:   Thu Mar 22 11:20:24 2018 +0100

    build: add missing gio-unix-2.0 dependency
    
    Fixes
    
    ../src/gmw-main.c:25:10: fatal error: gio/gunixfdlist.h: No such file or directory
     #include <gio/gunixfdlist.h>
              ^~~~~~~~~~~~~~~~~~~

 meson.build     | 1 +
 src/meson.build | 1 +
 2 files changed, 2 insertions(+)
---
diff --git a/meson.build b/meson.build
index 2a9a7ba..57892dc 100644
--- a/meson.build
+++ b/meson.build
@@ -80,6 +80,7 @@ prefixed_datadir = join_paths(get_option('prefix'), get_option('datadir'))
 
 gtk = dependency('gtk+-3.0', version : '>= 3.11.2')
 gio = dependency('gio-2.0')
+gio_unix = dependency('gio-unix-2.0')
 gusb = dependency('gusb', version : '>= 0.2.7')
 udisks = dependency('udisks2')
 gudev = dependency('gudev-1.0')
diff --git a/src/meson.build b/src/meson.build
index cc97464..bd62dbe 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -18,6 +18,7 @@ executable(
     include_directories('..'),
   ],
   dependencies : [
+    gio_unix,
     gtk,
     gusb,
     udisks,