[gnome-color-manager] build: Respect libexecdir for gcm-helper-exiv

[Jürg Billeter <juergbi src gnome org>]

commit 3620f9bc7e5f4f3cae856eaeac1046a41da69164
Author: Jürg Billeter <j bitron ch>
Date:   Wed Sep 13 17:33:47 2017 +0200

    build: Respect libexecdir for gcm-helper-exiv

 src/meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/meson.build b/src/meson.build
index ebf0b04..e904d9f 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -29,7 +29,7 @@ if get_option('enable-exiv')
     ],
     c_args : cargs,
     install : true,
-    install_dir : 'libexec',
+    install_dir : get_option('libexecdir'),
   )
 endif