chore(supergfxctl-gex): Update spec to use substitutions (#47)

Use subs for %{SOURCE0} and %{version} instead of hard coding each

Signed-off-by: RJ Sampson <[email protected]>

staging/gnome-shell-extension-supergfxctl-gex/gnome-shell-extension-supergfxctl-gex.spec

@@ -7,11 +7,9 @@ Summary:        Extension for visualizing supergfxctl settings and status.
 
 License:        MIT
 URL:            https://extensions.gnome.org/extension/5344/supergfxctl-gex
-Source0:        https://extensions.gnome.org/extension-data/supergfxctl-gexasus-linux.org.v33.shell-extension.zip
+Source0:        https://extensions.gnome.org/extension-data/supergfxctl-gexasus-linux.org.v%{version}.shell-extension.zip
 BuildArch:      noarch
 
-BuildRequires:  wget
-
 Requires:       gnome-shell-extension-common
 Requires:       dconf-editor
 Requires:       dconf
@@ -21,9 +19,7 @@ Requires:       supergfxctl
 Extension for visualizing supergfxctl settings and status.
 
 %prep
-wget -q https://extensions.gnome.org/extension-data/supergfxctl-gexasus-linux.org.v33.shell-extension.zip -O %{name}.zip
-unzip %{name}.zip
-rm -f %{name}.zip
+unzip %{SOURCE0}
 
 %install
 mkdir -p %{buildroot}%{extdir}/