Update to v094r01 release.

byuu says:

Changelog:
- port: various compilation fixes for OS X [kode54]
- nall: added programpath() function to return path to process binary
  [todo: need to have ethos use this function]
- ruby: XAudio2 will select default game sound device instead of first
  sound device
- ruby: DirectInput device IDs are no longer ambiguous when VID+PID are
  identical
- ruby: OpenGL won't try and terminate if it hasn't been initialized
- gb: D-pad up+down/left+right not masked in SGB mode
- sfc: rewrote ICD2 video rendering to output in real-time, work with
  cycle-based Game Boy renderer
- sfc: rewrote Bus::reduce(), reduces game loading time by about 500ms
- ethos: store save states in {game}/higan/* instead of {game}/bsnes/*
- loki: added target-loki/ (blank stub for now)
- Makefile: purge out/* on make clean

nall/string/base.hpp

@@ -201,6 +201,7 @@ template<signed precision = 0, char padchar = '0'> inline string binary(uintmax_
 //platform.hpp
 inline string activepath();
 inline string realpath(const string& name);
+inline string programpath();
 inline string userpath();
 inline string configpath();
 inline string sharedpath();

nall/string/platform.hpp

@@ -22,6 +22,20 @@ string realpath(const string& name) {
   return result;
 }
 
+string programpath() {
+  #if defined(PLATFORM_WINDOWS)
+  int argc = 0;
+  wchar_t** argv = CommandLineToArgvW(GetCommandLine(), &argc);
+  string argv0 = (const char*)utf8_t(argv[0]);
+  LocalFree(argv);
+  return realpath(argv0);
+  #else
+  Dl_info info;
+  dladdr((void*)&programpath, &info);
+  return realpath(info.dli_fname);
+  #endif
+}
+
 // /home/username/
 // c:/users/username/
 string userpath() {