Implement/set latency value for VST2

Signed-off-by: falkTX <falktx@falktx.com>

distrho/src/DistrhoPlugin.cpp

@@ -125,7 +125,7 @@ const TimePosition& Plugin::getTimePosition() const noexcept
 #endif
 
 #if DISTRHO_PLUGIN_WANT_LATENCY
-void Plugin::setLatency(uint32_t frames) noexcept
+void Plugin::setLatency(const uint32_t frames) noexcept
 {
     pData->latency = frames;
 }

distrho/src/DistrhoPluginVST2.cpp

@@ -1212,6 +1212,10 @@ private:
             const ParameterRanges& ranges(fPlugin.getParameterRanges(i));
             hostCallback(VST_HOST_OPCODE_00, i, 0, nullptr, ranges.getNormalizedValue(curValue));
         }
+
+       #if DISTRHO_PLUGIN_WANT_LATENCY
+        fEffect->delay = fPlugin.getLatency();
+       #endif
     }
 
 #if DISTRHO_PLUGIN_HAS_UI