x64 and hsfload improvements, build every REL (#582)

* Port some of hsfload.c

* More byteswaps in hsfload.c

* Finish hsfload besides cenv

* hsfload fixes

* Some x64 improvements

* More x64 improvements

* 64 bit improvements

* Link in lots of files

* Fix armem bug

* Fix dll killing, load modeseldll

* Fixes, clearing TODOs

* Tons of warning/error fixes

* Linux build fixes

* Add -fPIC flag to fix build on x64 linux

* GXSETARRAY sizes and misc fixes

* More fixes

* Build all RELs

* Implement C_Quat functions

* Fix PAL build

include/ext_math.h

@@ -4,7 +4,9 @@
 #include "math.h"
 #include "dolphin/mtx.h"
 
+#ifndef M_PI
 #define M_PI 3.141592653589793
+#endif
 
 typedef struct vec2f {
     float x;
@@ -36,6 +38,7 @@ typedef struct vec2f {
 
 #ifndef __MWERKS__
 void HuSetVecF(Vec *arg0, f32 arg8, f32 arg9, f32 argA);
+void HuSubVecF(Vec* out, Vec* in, Vec* sub);
 #endif
 
 #endif