Remove ctype.h include that's no longer needed.

See also bkaradzic/bimg#51 and 0c9cb2786f.

src/image_decode.cpp

@@ -16,9 +16,6 @@ BX_PRAGMA_DIAGNOSTIC_IGNORED_MSVC(4018) // warning C4018:  '<': signed/unsigned
 BX_PRAGMA_DIAGNOSTIC_IGNORED_MSVC(4100) // error C4100: '' : unreferenced formal parameter
 BX_PRAGMA_DIAGNOSTIC_IGNORED_MSVC(4389) // warning C4389 : '==' : signed / unsigned mismatch
 BX_PRAGMA_DIAGNOSTIC_IGNORED_MSVC(4505) // warning C4505: 'tinyexr::miniz::def_realloc_func': unreferenced local function has been removed
-#if BX_PLATFORM_EMSCRIPTEN
-#	include <ctype.h>
-#endif // BX_PLATFORM_EMSCRIPTEN
 #define MINIZ_NO_ARCHIVE_APIS
 #define MINIZ_NO_STDIO
 #define TINYEXR_IMPLEMENTATION