Add missing entry in .gitignore for utils_test

Submitted-by: Max <max.suraev@fairwaves.co>
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/.gitignore b/.gitignore
index c85d04d..3fa1bbc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,6 +55,7 @@
 tests/testsuite.dir/
 tests/testsuite.log
 
+tests/utils/utils_test
 tests/sms/sms_test
 tests/timer/timer_test
 tests/msgfile/msgfile_test