[fractal/remove-unused-imports: 2/2] flatpak: set RUSTFLAGS to ""

[Daniel Garcia Moreno <danigm src gnome org>]

commit 4fca2f0ca79afef20c53960d04dca482633213f7
Author: Daniel García Moreno <dani danigm net>
Date:   Thu Jan 23 18:05:58 2020 +0100

    flatpak: set RUSTFLAGS to ""
    
    Building with gnome-builder fails, this patch add the RUSTFLAGS that
    will fix the 'error-format' problem.

 flatpak/org.gnome.Fractal.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/flatpak/org.gnome.Fractal.json b/flatpak/org.gnome.Fractal.json
index 0152fc4b..d240e0e9 100644
--- a/flatpak/org.gnome.Fractal.json
+++ b/flatpak/org.gnome.Fractal.json
@@ -31,7 +31,8 @@
         ],
         "env" : {
             "CARGO_HOME" : "/run/build/Fractal/cargo",
-            "RUST_BACKTRACE" : "1"
+            "RUST_BACKTRACE" : "1",
+            "RUSTFLAGS" : ""
         }
     },
     "add-extensions": {