Move build.c definitions to the makefile, introduce and use libultra version defines in libultra instead of PLATFORM defines (#2353)

* Move build.c definitions to the makefile, introduce and use libultra version defines in libultra instead of PLATFORM defines

* MAJOR+MINOR versions -> VERSION+PATCH, stringify build defines in makefile, let the libultra version determine the OPTFLAGS for libultra files

* Clang format moment

* Remove LIBULTRA_VERSION_ID, tweak OS_VERSION and libultra version definitions

* Better fix for formatting problems

include/ultra64.h

@@ -31,6 +31,7 @@
 #include "ultra64/motor.h"
 #include "ultra64/R4300.h"
 #include "ultra64/ucode.h"
+#include "ultra64/version.h"
 
 union uObjBg;
 
@@ -42,7 +43,7 @@ void osStopThread(OSThread* thread);
 void osViExtendVStart(u32 value);
 s32 osRecvMesg(OSMesgQueue* mq, OSMesg* msg, s32 flag);
 
-#if PLATFORM_N64
+#if LIBULTRA_VERSION < LIBULTRA_VERSION_K
 void osInitialize(void);
 #else
 #define osInitialize()               \

include/ultra64/version.h

@@ -0,0 +1,14 @@
+#ifndef ULTRA64_VERSION_H
+#define ULTRA64_VERSION_H
+
+#define LIBULTRA_VERSION_D  'D'
+#define LIBULTRA_VERSION_E  'E'
+#define LIBULTRA_VERSION_F  'F'
+#define LIBULTRA_VERSION_G  'G'
+#define LIBULTRA_VERSION_H  'H'
+#define LIBULTRA_VERSION_I  'I'
+#define LIBULTRA_VERSION_J  'J'
+#define LIBULTRA_VERSION_K  'K'
+#define LIBULTRA_VERSION_L  'L'
+
+#endif