Attempt to fix short passwords on mac+win

src/connection.cpp

@@ -152,11 +152,17 @@ QString randomPassword() {
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
         "abcdefghijklmnopqrstuvwxyz";
 
-    const int passwordLength = 10;
+    // Assume we have low entropy randomness,
+    // so we generate a longer password than we probably need
+    const int passwordLength = 32;
     char* s = new char[passwordLength + 1];
 
     for (int i = 0; i < passwordLength; ++i) {
+#ifdef Q_OS_LINUX
         s[i] = alphanum[randombytes_uniform(sizeof(alphanum))];
+#else
+        s[i] = alphanum[rand() % (sizeof(alphanum) - 1)];
+#endif
     }
 
     s[passwordLength] = 0;