Migrate from qrand() to std::rand()

qrand() is deprecated since Qt 5.15.

plugins/qca-ossl/qca-ossl.cpp

@@ -6576,10 +6576,10 @@ public:
 
         // seed the RNG if it's not seeded yet
         if (RAND_status() == 0) {
-            qsrand(time(nullptr));
+            std::srand(time(nullptr));
             char buf[128];
             for (char &n : buf)
-                n = qrand();
+                n = std::rand();
             RAND_seed(buf, 128);
         }
 

src/qca_default.cpp

@@ -107,7 +107,7 @@ public:
     {
         SecureArray buf(size);
         for (int n = 0; n < (int)buf.size(); ++n)
-            buf[n] = (char)qrand();
+            buf[n] = (char)std::rand();
         return buf;
     }
 };
@@ -1253,7 +1253,7 @@ public:
         uint t = now.toSecsSinceEpoch();
         if (now.time().msec() > 0)
             t /= now.time().msec();
-        qsrand(t);
+        std::srand(t);
     }
 
     int version() const override