Use mariadb-connector-c for RHEL 8+

https://github.com/Icinga/icinga-packaging/issues/205

icinga2.spec

@@ -251,9 +251,13 @@ BuildRequires:  libmysqlclient-devel
 BuildRequires:  mysql-devel
 %endif
 
+%else
+%if 0%{?rhel} >= 8
+BuildRequires:  mariadb-connector-c-devel
 %else
 BuildRequires:  mysql-devel
 %endif #suse
+%endif
 
 Requires:       %{name}-bin = %{version}-%{release}
 
@@ -643,6 +647,7 @@ getent passwd %{icinga_user} >/dev/null || %{_sbindir}/useradd -c "icinga" -s /s
 %endif
 %endif
 
+%if %{with mysql}
 %post ido-mysql
 if [ ${1:-0} -eq 1 ] && [ -e %{_sysconfdir}/%{name}/features-enabled/ido-mysql.conf ]
 then
@@ -659,7 +664,9 @@ if [ "$1" = "0" ]; then
 fi
 
 exit 0
+%endif
 
+%if %{with pgsql}
 %post ido-pgsql
 if [ ${1:-0} -eq 1 ] && [ -e %{_sysconfdir}/%{name}/features-enabled/ido-pgsql.conf ]
 then
@@ -676,6 +683,7 @@ if [ "$1" = "0" ]; then
 fi
 
 exit 0
+%endif
 
 %if 0%{?use_selinux}
 %post selinux