Update .gitignore with new tests

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/.gitignore b/.gitignore
index a3bfdd2..bb77df2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,6 +49,8 @@
 tests/ussd/ussd_test
 tests/smscb/smscb_test
 tests/bits/bitrev_test
+tests/a5/a5_test
+tests/conv/conv_test
 
 utils/osmo-arfcn