normalize header guards to {tu_name}_H_ (#87)

i previously had a bad habit of using double underscores in include
guard macro names, which are implementation-reserved per
the C++98 standard (see 17.4.3.1.2 Global names).

Co-authored-by: Pheenoh <pheenoh@gmail.com>

include/JSystem/JUtility/JUTFont/JUTFont.h

@@ -1,5 +1,5 @@
-#ifndef JSYSTEM_JUTILITY_JUTFONT_H
-#define JSYSTEM_JUTILITY_JUTFONT_H
+#ifndef JSYSTEM_JUTILITY_JUTFONT_H_
+#define JSYSTEM_JUTILITY_JUTFONT_H_
 
 #include "global.h"
 #include "gx/GX.h"

include/JSystem/JUtility/JUTGamePad/JUTGamePad.h

@@ -1,5 +1,5 @@
-#ifndef __JSYSTEM_JUTILITY_JUTGAMEPAD__
-#define __JSYSTEM_JUTILITY_JUTGAMEPAD__
+#ifndef JSYSTEM_JUTILITY_JUTGAMEPAD_
+#define JSYSTEM_JUTILITY_JUTGAMEPAD_
 
 #include "JSystem/JKernel/JKRDisposer/JKRDisposer.h"
 #include "JSystem/JSupport/JSUList/JSUList.h"

include/JSystem/JUtility/JUTResFont.h

@@ -1,5 +1,5 @@
-#ifndef JSYSTEM_JUTILITY_JUT_RES_FONT
-#define JSYSTEM_JUTILITY_JUT_RES_FONT
+#ifndef JSYSTEM_JUTILITY_JUT_RES_FONT_
+#define JSYSTEM_JUTILITY_JUT_RES_FONT_
 
 #include "JSystem/JKernel/JKRHeap/JKRHeap.h"
 #include "JSystem/JUtility/JUTFont/JUTFont.h"

include/JSystem/JUtility/JUTVideo/JUTVideo.h

@@ -1,5 +1,5 @@
-#ifndef __JUTILITY_JUTVIDEO_JUTVIDEO_H__
-#define __JUTILITY_JUTVIDEO_JUTVIDEO_H__
+#ifndef JUTILITY_JUTVIDEO_JUTVIDEO_H_
+#define JUTILITY_JUTVIDEO_JUTVIDEO_H_
 
 #include "gx/GX.h"
 #include "os/OS.h"

include/JSystem/JUtility/JUTXfb/JUTXfb.h

@@ -1,5 +1,5 @@
-#ifndef __JUTILITY_JUTXFB_JUTXFB_H__
-#define __JUTILITY_JUTXFB_JUTXFB_H__
+#ifndef JUTILITY_JUTXFB_JUTXFB_H_
+#define JUTILITY_JUTXFB_JUTXFB_H_
 
 #include "JSystem/JKernel/JKRHeap/JKRHeap.h"
 #include "dolphin/types.h"