Minor header cleanup

Add Header required for liblcf#499

Author: Ghabry

src/audio_generic.cpp

@@ -458,7 +458,7 @@ void GenericAudio::Decode(uint8_t* output_buffer, int buffer_length) {
 
 	if (channel_active) {
 		if (total_volume > 1.0) {
-			float threshold = 0.8;
+			float threshold = 0.8f;
 			for (unsigned i = 0; i < (unsigned)(samples_per_frame * 2); i++) {
 				float sample = mixer_buffer[i];
 				float sign = (sample < 0) ? -1.0 : 1.0;

src/fileext_guesser.cpp

@@ -22,7 +22,7 @@
 #include "meta.h"
 #include "output.h"
 #include "string_view.h"
-
+#include <sstream>
 
 namespace {
 	const std::string RtPrefix = "rpg_rt.";

src/game_ineluki.h

@@ -22,6 +22,7 @@
 #include <string>
 #include <vector>
 #include <map>
+#include <array>
 
 #include <lcf/rpg/sound.h>
 

src/utils.cpp

@@ -17,15 +17,14 @@
 
 // Headers
 #include "utils.h"
-#include "output.h"
 #include "compiler.h"
 #include <cassert>
 #include <cstdint>
 #include <cinttypes>
 #include <cstdio>
 #include <algorithm>
-#include <random>
 #include <cctype>
+#include <istream>
 #include <zlib.h>
 
 namespace {

src/utils.h

@@ -22,9 +22,7 @@
 #include <ctime>
 #include <functional>
 #include <string>
-#include <sstream>
 #include <vector>
-#include <random>
 #include "string_view.h"
 #include "span.h"
 

src/window_input_settings.cpp

@@ -20,7 +20,7 @@
 #include "bitmap.h"
 #include "input_buttons.h"
 #include "window_selectable.h"
-
+#include <sstream>
 
 Window_InputSettings::Window_InputSettings(int ix, int iy, int iwidth, int iheight) :
 	Window_Selectable(ix, iy, iwidth, iheight) {