[librsvg] COMPILING.md: update fedora deps

[Jordan Petridis <jpetridis src gnome org>]

commit 33d3555683c38599c03b4b8d3fdcaa5809942f95
Author: Jordan Petridis <jpetridis gnome org>
Date:   Sun Oct 13 17:58:06 2019 +0300

    COMPILING.md: update fedora deps

 COMPILING.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/COMPILING.md b/COMPILING.md
index d2054efd..fea5bc42 100644
--- a/COMPILING.md
+++ b/COMPILING.md
@@ -76,7 +76,7 @@ PATH="$PATH:/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0"
 dnf install -y gcc rust rust-std-static cargo make \
 automake autoconf libtool gettext itstool \
 gdk-pixbuf2-devel gobject-introspection-devel \
-gtk-doc git redhat-rpm-config \
+gtk-doc git redhat-rpm-config gettext-devel \
 libxml2-devel libcroco-devel cairo-devel pango-devel
 ```