Fix compilation under MSVC and remove unnecessary conditional function prototype

Thanks to SmallJoker for pointing this out.

src/gettext.h

@@ -32,12 +32,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define gettext_noop(String) (String)
 #define N_(String) gettext_noop((String))
 
-#ifdef _MSC_VER
 void init_gettext(const char *path, const std::string &configured_language,
-		int argc, const char *argv[]);
-#else
-void init_gettext(const char *path, const std::string &configured_language);
-#endif
+	int argc, char *argv[]);
 
 extern wchar_t *utf8_to_wide_c(const char *str);