pjproject_bundled: Add --disable-libwebrtc to configure

Without the disable, pjproject tries to build it's internal
webrtc implementation which requires sse2.  This fails on
platforms without sse2.

ASTERISK-26930 #close
Reported-by: abelbeck

Change-Id: I07231f9160c35cfa42b194d3aad4e7d51fd9a410

third-party/pjproject/Makefile.rules

@@ -24,6 +24,7 @@ PJPROJECT_CONFIG_OPTS = --prefix=/opt/pjproject \
 	--disable-ffmpeg \
 	--disable-openh264 \
 	--disable-ipp \
+	--disable-libwebrtc \
 	--without-external-pa \
 	--without-external-srtp \
 	--without-external-webrtc