[libgweather] build: Fix build error in Fedora CI

[Bastien Nocera <hadess src gnome org>]

commit b7fbf100c5cea39e62c2a1902d1b4f327d7c3f5a
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Dec 14 11:04:29 2017 +0100

    build: Fix build error in Fedora CI
    
    Add redhat-rpm-config package to Fedora CI to fix:
    gcc: error: /usr/lib/rpm/redhat/redhat-hardened-cc1: No such file or directory
    while building GIR file.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5a9f16c..aeb4db7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 build-fedora:
   image: fedora:latest
   before_script:
-    - dnf install -y meson libxml2-devel vala gettext itstool gtk3-devel geocode-glib-devel 
gobject-introspection-devel libsoup-devel
+    - dnf install -y redhat-rpm-config meson libxml2-devel vala gettext itstool gtk3-devel 
geocode-glib-devel gobject-introspection-devel libsoup-devel
   script:
     - meson _build
     - ninja -C _build test