[gedit] meson: Add rpath

[Jeremy Bicha <jbicha src gnome org>]

commit c43bbb7d7121f7bceffff4636e4ca504e22d1251
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Wed Jan 9 20:28:08 2019 -0500

    meson: Add rpath
    
    Fixes:
    ```
    gedit: error while loading shared libraries: libgedit-3.14.so:
     cannot open shared object file: No such file or directory
    ```

 gedit/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gedit/meson.build b/gedit/meson.build
index d388a1f3a..b92045394 100644
--- a/gedit/meson.build
+++ b/gedit/meson.build
@@ -304,4 +304,5 @@ gedit_exe = executable(
   c_args: gedit_c_args,
   install: true,
   install_dir: bindir,
+  install_rpath: pkglibdir,
 )