ignore results of .ttcnpp files

Add another macro ignore_pp_results to gen_links.sh.inc and call from all
gen_links.sh files, to add results of *.ttcnpp files, i.e. generated *.ttcn
files, to .gitignore.

Change-Id: Ic7fb176226771212d7700dafaf27ac71f12a4a61
diff --git a/mgw/gen_links.sh b/mgw/gen_links.sh
index 445be50..d307148 100755
--- a/mgw/gen_links.sh
+++ b/mgw/gen_links.sh
@@ -32,3 +32,5 @@
 DIR=../library
 FILES="General_Types.ttcn Osmocom_Types.ttcn MGCP_Types.ttcn MGCP_Templates.ttcn MGCP_CodecPort.ttcn MGCP_CodecPort_CtrlFunct.ttcn MGCP_CodecPort_CtrlFunctDef.cc RTP_CodecPort.ttcn"
 gen_links $DIR $FILES
+
+ignore_pp_results