MSVC 2015 compatibility: give up also on this.

src/Magnum/Test/ImageTest.cpp

@@ -219,6 +219,9 @@ void ImageTest::toReference() {
         #ifdef CORRADE_GCC47_COMPATIBILITY
         CORRADE_EXPECT_FAIL("Rvalue references for *this are not supported in GCC < 4.8.1.");
         #endif
+        #ifdef CORRADE_MSVC2015_COMPATIBILITY
+        CORRADE_EXPECT_FAIL("std::is_convertible is still buggy in MSVC 2015.");
+        #endif
         CORRADE_VERIFY(!(std::is_convertible<const Image2D, ImageView2D>::value));
         CORRADE_VERIFY(!(std::is_convertible<const Image2D&&, ImageView2D>::value));
     }
@@ -246,6 +249,9 @@ void ImageTest::toReferenceCommpressed() {
         #ifdef CORRADE_GCC47_COMPATIBILITY
         CORRADE_EXPECT_FAIL("Rvalue references for *this are not supported in GCC < 4.8.1.");
         #endif
+        #ifdef CORRADE_MSVC2015_COMPATIBILITY
+        CORRADE_EXPECT_FAIL("std::is_convertible is still buggy in MSVC 2015.");
+        #endif
         CORRADE_VERIFY(!(std::is_convertible<const CompressedImage2D, CompressedImageView2D>::value));
         CORRADE_VERIFY(!(std::is_convertible<const CompressedImage2D&&, CompressedImageView2D>::value));
     }

src/Magnum/Trade/Test/ImageDataTest.cpp

@@ -180,6 +180,9 @@ void ImageDataTest::toReference() {
         #ifdef CORRADE_GCC47_COMPATIBILITY
         CORRADE_EXPECT_FAIL("Rvalue references for *this are not supported in GCC < 4.8.1.");
         #endif
+        #ifdef CORRADE_MSVC2015_COMPATIBILITY
+        CORRADE_EXPECT_FAIL("std::is_convertible is still buggy in MSVC 2015.");
+        #endif
         CORRADE_VERIFY(!(std::is_convertible<const Trade::ImageData2D, ImageView2D>::value));
         CORRADE_VERIFY(!(std::is_convertible<const Trade::ImageData2D&&, ImageView2D>::value));
     }
@@ -200,6 +203,9 @@ void ImageDataTest::toReferenceCompressed() {
         #ifdef CORRADE_GCC47_COMPATIBILITY
         CORRADE_EXPECT_FAIL("Rvalue references for *this are not supported in GCC < 4.8.1.");
         #endif
+        #ifdef CORRADE_MSVC2015_COMPATIBILITY
+        CORRADE_EXPECT_FAIL("std::is_convertible is still buggy in MSVC 2015.");
+        #endif
         CORRADE_VERIFY(!(std::is_convertible<const Trade::ImageData2D, CompressedImageView2D>::value));
         CORRADE_VERIFY(!(std::is_convertible<const Trade::ImageData2D&&, CompressedImageView2D>::value));
     }