Delete the vertex cache option from the code.

headless/Headless.cpp

@@ -472,7 +472,6 @@ int main(int argc, const char* argv[])
 	g_Config.bHardwareTransform = true;
 	g_Config.iAnisotropyLevel = 0;  // When testing mipmapping we really don't want this.
 	g_Config.iMultiSampleLevel = 0;
-	g_Config.bVertexCache = false;
 	g_Config.iLanguage = PSP_SYSTEMPARAM_LANGUAGE_ENGLISH;
 	g_Config.iTimeFormat = PSP_SYSTEMPARAM_TIME_FORMAT_24HR;
 	g_Config.bEncryptSave = true;