fixed rpm packaging GH #1231

(cherry picked from commit 6b3b815ce6)

el/rtpengine.spec

@@ -17,7 +17,9 @@ BuildRequires:	glib2-devel libcurl-devel openssl-devel pcre-devel
 BuildRequires:	xmlrpc-c-devel zlib-devel hiredis-devel
 BuildRequires:	libpcap-devel libevent-devel json-glib-devel 
 BuildRequires:	gperf perl-IPC-Cmd
-BuildRequires:  pkgconfig(spandsp)
+BuildRequires:	perl-podlators
+BuildRequires:	pkgconfig(libwebsockets)
+BuildRequires:	pkgconfig(spandsp)
 Requires(pre):	shadow-utils
 
 %if 0%{?with_transcoding} > 0