Support for calling functions with PASCAL and REGISTER calling conventions on x86 Windows/Linux.

Also changed indentation to be more consistent throughout the (adjusted) files.

src/x86/ffitarget.h

@@ -82,6 +82,8 @@ typedef enum ffi_abi {
   FFI_THISCALL,
   FFI_FASTCALL,
   FFI_MS_CDECL,
+  FFI_PASCAL,
+  FFI_REGISTER,
   FFI_LAST_ABI,
 #ifdef _MSC_VER
   FFI_DEFAULT_ABI = FFI_MS_CDECL
@@ -101,6 +103,8 @@ typedef enum ffi_abi {
   FFI_THISCALL,
   FFI_FASTCALL,
   FFI_STDCALL,
+  FFI_PASCAL,
+  FFI_REGISTER,
   FFI_LAST_ABI,
 #if defined(__i386__) || defined(__i386)
   FFI_DEFAULT_ABI = FFI_SYSV