Misc (re #1068): fix compile errors/warnings on Symbian S60 5th ed.



git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@3255 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/build.symbian/libgsmcodec.mmp b/build.symbian/libgsmcodec.mmp
index 1b301f8..875555b 100644
--- a/build.symbian/libgsmcodec.mmp
+++ b/build.symbian/libgsmcodec.mmp
@@ -64,6 +64,7 @@
 
 SYSTEMINCLUDE	..\pjmedia\include
 SYSTEMINCLUDE	..\pjlib\include 
+SYSTEMINCLUDE	..\third_party\build\gsm
 SYSTEMINCLUDE	..\third_party\gsm\inc
 
 SYSTEMINCLUDE	\epoc32\include