Fixed warnings.

src/image_decode.cpp

@@ -12,7 +12,9 @@ BX_PRAGMA_DIAGNOSTIC_IGNORED_CLANG_GCC("-Wtype-limits")
 BX_PRAGMA_DIAGNOSTIC_IGNORED_CLANG_GCC("-Wunused-parameter")
 BX_PRAGMA_DIAGNOSTIC_IGNORED_CLANG_GCC("-Wunused-value")
 BX_PRAGMA_DIAGNOSTIC_IGNORED_CLANG("-Wdeprecated-declarations")
+BX_PRAGMA_DIAGNOSTIC_IGNORED_MSVC(4018) // warning C4018:  '<': signed/unsigned mismatch
 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 <compat/ctype.h>
@@ -25,6 +27,7 @@ BX_PRAGMA_DIAGNOSTIC_POP()
 
 BX_PRAGMA_DIAGNOSTIC_PUSH();
 BX_PRAGMA_DIAGNOSTIC_IGNORED_MSVC(4127) // warning C4127: conditional expression is constant
+BX_PRAGMA_DIAGNOSTIC_IGNORED_MSVC(4267) // warning C4267 : '=' : conversion from 'size_t' to 'unsigned short', possible loss of data
 #define LODEPNG_NO_COMPILE_ENCODER
 #define LODEPNG_NO_COMPILE_DISK
 #define LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS