Initialize the random number generator

We use random numbers for file names, both temporary filename when
creating a zip for divelogs.de upload and for filename on form data for
facebook upload. This does not require for true randomness but we still
want these to not be constant on each run of Subsurface. Thus we need to
initialize the random number generator.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

main.cpp

@@ -58,6 +58,14 @@ int main(int argc, char **argv)
 #else
 	git_libgit2_init();
 #endif
+	/*
+	 * Initialize the random number generator - not really secure as
+	 * this is based only on current time, but it should not matter
+	 * that much in our context. Moreover this is better than
+	 * the constant numbers we used to get before.
+	 */
+	qsrand(time(NULL));
+
 	setup_system_prefs();
 	copy_prefs(&default_prefs, &prefs);
 	fill_profile_color();