missing/explicit_bzero.c: Fixup r52806

Maybe kosaki had a better version, but CI failure emails are
annoying.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52819 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/missing/explicit_bzero.c b/missing/explicit_bzero.c
new file mode 100644
index 0000000000..cb11bd6da1
--- /dev/null
+++ b/missing/explicit_bzero.c
@@ -0,0 +1,8 @@
+#include <string.h>
+
+/* prevent the compiler from optimizing away memset or bzero */
+void
+explicit_bzero(void *p, size_t n)
+{
+    memset(p, 0, n);
+}