actually add bb_qsort.c

*: s/Denis/Denys/

libbb/bb_qsort.c

@@ -0,0 +1,20 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Wrapper for common string vector sorting operation
+ *
+ * Copyright (c) 2008 Denys Vlasenko
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+int bb_pstrcmp(const void *a, const void *b)
+{
+	return strcmp(*(char**)a, *(char**)b);
+}
+
+void qsort_string_vector(char **sv, unsigned count)
+{
+	qsort(sv, count, sizeof(char*), bb_pstrcmp);
+}