thorvg: Tests failing on Windows using MSVC

Hi all,

The new static png and jpg loaders are compiling perfectly on Windows x64 MSVC. However when I run the tests, I get 4 errors.

Summary:
    ThorVG version:        0.5.99
    Build Type:            release
    Prefix:                c:/
    SIMD Instruction:      none
    Raster Engine (SW):    true
    Raster Engine (GL):    false
    Loader (TVG):          true
    Loader (SVG):          true
    Loader (PNG):          true
    Loader (JPG):          true
    Saver (TVG):           true
    CAPI Binding:          false
    Log Message:           true
    Tests:                 true
    Examples:              false
    Tool (Svg2Tvg):        false
    Tool (Svg2Png):        false

User defined options
    backend        : ninja
    buildtype      : release
    debug          : false
    default_library: static
    loaders        : all
    log            : true
    savers         : tvg
    tests          : true

../test/testPicture.cpp(139): FAILED:
  REQUIRE( picture->load(data, size, "", false) == Result::Success )
with expansion:
  5 == 0

../test/testPicture.cpp(183): FAILED:
  REQUIRE( picture->load(data, size, "", false) == Result::Success )
with expansion:
  5 == 0

../test/testScene.cpp(68): FAILED:
  REQUIRE( scene->reserve(-1) == Result::FailedAllocation )
with expansion:
  0 == 3

../test/testSwCanvasBase.cpp(43): FAILED:
  REQUIRE( canvas->reserve(-1) == Result::FailedAllocation )
with expansion:
  0 == 3