More ticket #61: enabled SRTP on Symbian

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@1979 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/build.symbian/pjlib_util.mmp b/build.symbian/pjlib_util.mmp
index 9f8ed50..1270d9c 100644
--- a/build.symbian/pjlib_util.mmp
+++ b/build.symbian/pjlib_util.mmp
@@ -29,6 +29,7 @@
 //
 // PJLIB-UTIL files
 //
+SOURCE	base64.c
 SOURCE	crc32.c
 SOURCE	dns.c
 SOURCE	dns_dump.c