GCC 4.5 compatibility: fix the merge.

This was already fixed earlier but I forgot to copy it over in
9ea4f85968 merge commit.

src/Magnum/Test/AbstractShaderProgramGLTest.cpp

@@ -105,7 +105,7 @@ void AbstractShaderProgramGLTest::construct() {
 
 void AbstractShaderProgramGLTest::constructCopy() {
     #ifndef CORRADE_GCC44_COMPATIBILITY
-    CORRADE_VERIFY(!(std::is_constructible<DummyShader, const DummyShader&>{}));
+    CORRADE_VERIFY(!(std::is_constructible<DummyShader, const DummyShader&>::value));
     /* GCC 4.6 doesn't have std::is_assignable */
     #ifndef CORRADE_GCC46_COMPATIBILITY
     CORRADE_VERIFY(!(std::is_assignable<DummyShader, const DummyShader&>{}));

src/Magnum/Test/FramebufferGLTest.cpp

@@ -147,7 +147,7 @@ void FramebufferGLTest::construct() {
 
 void FramebufferGLTest::constructCopy() {
     #ifndef CORRADE_GCC44_COMPATIBILITY
-    CORRADE_VERIFY(!(std::is_constructible<Framebuffer, const Framebuffer&>{}));
+    CORRADE_VERIFY(!(std::is_constructible<Framebuffer, const Framebuffer&>::value));
     /* GCC 4.6 doesn't have std::is_assignable */
     #ifndef CORRADE_GCC46_COMPATIBILITY
     CORRADE_VERIFY(!(std::is_assignable<Framebuffer, const Framebuffer&>{}));

src/Magnum/Test/MeshGLTest.cpp

@@ -190,7 +190,7 @@ void MeshGLTest::construct() {
 
 void MeshGLTest::constructCopy() {
     #ifndef CORRADE_GCC44_COMPATIBILITY
-    CORRADE_VERIFY(!(std::is_constructible<Mesh, const Mesh&>{}));
+    CORRADE_VERIFY(!(std::is_constructible<Mesh, const Mesh&>::value));
     /* GCC 4.6 doesn't have std::is_assignable */
     #ifndef CORRADE_GCC46_COMPATIBILITY
     CORRADE_VERIFY(!(std::is_assignable<Mesh, const Mesh&>{}));