Remove depreciate key in desktop file

xournalpp.spec

@@ -1,6 +1,8 @@
+%global         _with_cppunit 1
+
 Name:           xournalpp
 Version:        1.0.16
-Release:        7%{?dist}
+Release:        8%{?dist}
 Summary:        Handwriting note-taking software with PDF annotation support
 
 License:        GPLv2+
@@ -9,7 +11,9 @@ Source:        %{url}/archive/%{version}/%{name}-%{version}.tar.gz
 
 BuildRequires:  cmake3 >= 3.10
 BuildRequires:  desktop-file-utils
+%{?_with_cppunit:
 BuildRequires:  cppunit-devel >= 1.12-0
+}
 BuildRequires:  gcc-c++
 BuildRequires:  gettext
 BuildRequires:  libappstream-glib
@@ -57,12 +61,17 @@ sed -i 's|tlh-AA|tlh|g' po/tlh.po
 
 %build
 %cmake3 \
-        -DENABLE_CPPUNIT=ON \
+        %{_with_cppunit: -DENABLE_CPPUNIT=ON} \
         .
 %make_build
 
 %install
 %make_install
+
+#Remove depreciated key from desktop file
+desktop-file-install \
+ --remove-key="Encoding" \
+  %{buildroot}%{_datadir}/applications/com.github.%{name}.%{name}.desktop
 %find_lang %{name}
 
 #Remove scripts from icons interface
@@ -94,6 +103,9 @@ appstream-util validate-relax --nonet %{buildroot}%{_metainfodir}/com.github.%{n
 %{_datadir}/%{name}/ui
 
 %changelog
+* Sun Jan 12 2020 Luya Tshimbalanga <luya@fedoraproject.org> - 1.0.16-8
+- Remove depreciate key in desktop file
+
 * Mon Dec 16 2019 Luya Tshimbalanga <luya@fedoraproject.org> - 1.0.16-7
 - Remove architecture requirement for plugins and ui