travis: split valgrind check in its own script

script/cileaks.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -x
+
+# If this platform doesn't support test execution, bail out now
+if [ -n "$SKIP_TESTS" ];
+then
+	exit $?;
+fi
+
+if [ -n "$VALGRIND" -a -e "$(which valgrind)" ]; then
+	valgrind --leak-check=full --show-reachable=yes --error-exitcode=125 --suppressions=./libgit2_clar.supp _build/libgit2_clar $@ -ionline
+fi