Fixed Symbian build error caused by active socket addition to pjlib in ticket #531 (thanks Rodrigo Vega)

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@1962 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/build.symbian/pjlib_test.mmp b/build.symbian/pjlib_test.mmp
index 4c859d8..2f0738e 100644
--- a/build.symbian/pjlib_test.mmp
+++ b/build.symbian/pjlib_test.mmp
@@ -21,6 +21,7 @@
 
 // Test files
 
+SOURCE	activesock.c
 SOURCE	atomic.c
 SOURCE	echo_clt.c
 SOURCE	errno.c