minarch: fixes for DOSBox frame rate sync

- Properly sync current values for config knobs when using
  CORE_OPTIONS_V2 so cores see config values during init
- Honor SET_SYSTEM_AV_INFO and SET_GEOMETRY to keep fps/aspect in
  sync (fixes DOSBox Pure force output FPS until toggle)

Note that DOSBox pure is not part of NextUI right now, but these
minarch fixes are necessary for any external DOS pak to work.

Author: pvaibhav

workspace/all/minarch/minarch.c

@@ -4616,6 +4616,19 @@ static bool environment_callback(unsigned cmd, void *data) { // copied from pico
 			*out = core.saves_dir; // save_dir;
 		break;
 	}
+	case RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO: { /* 32 */
+		const struct retro_system_av_info *av = (const struct retro_system_av_info *)data;
+		if (av) {
+			double a = av->geometry.aspect_ratio;
+			if (a <= 0) a = (double)av->geometry.base_width / av->geometry.base_height;
+
+			core.fps = av->timing.fps;
+			core.sample_rate = av->timing.sample_rate;
+			core.aspect_ratio = a;
+			renderer.dst_p = 0;
+		}
+		return true;
+	}
 	case RETRO_ENVIRONMENT_SET_CONTROLLER_INFO: { /* 35 */
 		// LOG_info("RETRO_ENVIRONMENT_SET_CONTROLLER_INFO\n");
 		const struct retro_controller_info *infos = (const struct retro_controller_info *)data;
@@ -4636,6 +4649,16 @@ static bool environment_callback(unsigned cmd, void *data) { // copied from pico
 		break;
 	}
 	// RETRO_ENVIRONMENT_SET_MEMORY_MAPS (36 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+	case RETRO_ENVIRONMENT_SET_GEOMETRY: { /* 37 */
+		const struct retro_game_geometry *geom = (const struct retro_game_geometry *)data;
+		if (geom) {
+			double a = geom->aspect_ratio;
+			if (a <= 0) a = (double)geom->base_width / geom->base_height;
+			core.aspect_ratio = a;
+			renderer.dst_p = 0;
+		}
+		return true;
+	}
 	case RETRO_ENVIRONMENT_GET_LANGUAGE: { /* 39 */
 		// puts("RETRO_ENVIRONMENT_GET_LANGUAGE");
 		if (data) *(int *) data = RETRO_LANGUAGE_ENGLISH;
@@ -4758,15 +4781,19 @@ static bool environment_callback(unsigned cmd, void *data) { // copied from pico
 		if (data) {
 			OptionList_reset();
 			OptionList_v2_init((const struct retro_core_options_v2 *)data); 
+			Config_readOptions();
 		}
 		break;
 	}
 	case RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2_INTL: { /* 68 */
 		// puts("RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2_INTL");
 		if (data) {
 			const struct retro_core_options_v2_intl *intl = (const struct retro_core_options_v2_intl *)data;
-			OptionList_reset();
-			OptionList_v2_init(intl->us);
+			if (intl && intl->us) {
+				OptionList_reset();
+				OptionList_v2_init(intl->us);
+				Config_readOptions();
+			}
 		}
 		break;
 	}