[host] nvfbc: retry on failure to init

@quantum has observed nvfbc under rare circumstances fail to initialize,
this adds a retry to the init with a short delay to hopefully recover
from this situation.

host/platform/Windows/capture/NVFBC/src/nvfbc.c

@@ -316,6 +316,10 @@ static bool nvfbc_init(void)
   }
 
   int adapterIndex = option_get_int("nvfbc", "adapterIndex");
+
+  bool created = false;
+  for(int retry = 0; retry < 2; ++retry)
+  {
     // NOTE: Calling this on hardware that doesn't support NvFBC such as GeForce
     // causes a substantial performance pentalty even if it fails! As such we only
     // attempt NvFBC as a last resort, or if configured via the app:capture
@@ -335,19 +339,27 @@ static bool nvfbc_init(void)
           &this->maxWidth, &this->maxHeight))
         {
           adapterIndex = i;
+          created      = true;
           break;
         }
       }
       IDirect3D9_Release(d3d);
-
-    if (adapterIndex < 0)
-    {
-      free(privData);
-      return false;
-    }
     }
     else
+    {
       if (!NvFBCToSysCreate(adapterIndex, privData, privDataLen, &this->nvfbc, &this->maxWidth, &this->maxHeight))
+        continue;
+      created = true;
+    }
+
+    if (created)
+      break;
+
+    //10ms delay before retry
+    nsleep(10000000);
+  }
+
+  if (!created)
   {
     free(privData);
     return false;