Fedora: Always install python3-devel

With the recent switch to py3 we need to ensure python3-devel is
installed on Fedora >= 29 before pip installing any dependencies.

Change-Id: I21417687db5b3827c5272ed22f6dc95db13f2870
diff --git a/files/rpms/general b/files/rpms/general
index 5bf1e9a..15d329d 100644
--- a/files/rpms/general
+++ b/files/rpms/general
@@ -27,6 +27,7 @@
 postgresql-devel  # psycopg2
 psmisc
 pyOpenSSL # version in pip uses too much memory
+python3-devel # f29,f30
 python-devel
 redhat-rpm-config # missing dep for gcc hardening flags, see rhbz#1217376
 systemd-devel # for systemd-python