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/bts/gen_links.sh b/bts/gen_links.sh
index b2b7e92..b6c4e12 100755
--- a/bts/gen_links.sh
+++ b/bts/gen_links.sh
@@ -43,3 +43,5 @@
 FILES+="TRXC_Types.ttcn TRXC_CodecPort.ttcn TRXC_CodecPort_CtrlFunct.ttcn TRXC_CodecPort_CtrlFunctDef.cc "
 FILES+="PCUIF_Types.ttcn PCUIF_CodecPort.ttcn "
 gen_links $DIR $FILES
+
+ignore_pp_results