Tests/LibGfx: Enable non file input tests in Windows CI

All the file-based tests left out build, but they all fail at run time
with the error "No such file or directory" or a Core::File-based
assertion failure for the Benchmark test

Tests/CMakeLists.txt

@@ -12,6 +12,10 @@ add_subdirectory(LibTLS)
 add_subdirectory(LibUnicode)
 add_subdirectory(LibURL)
 
+if (ENABLE_GUI_TARGETS)
+    add_subdirectory(LibGfx)
+endif()
+
 # FIXME: Increase support for building targets on Windows
 if (WIN32 AND ENABLE_WINDOWS_CI)
     return()
@@ -23,7 +27,6 @@ add_subdirectory(LibWasm)
 add_subdirectory(LibXML)
 
 if (ENABLE_GUI_TARGETS)
-    add_subdirectory(LibGfx)
     add_subdirectory(LibMedia)
     add_subdirectory(LibWeb)
     add_subdirectory(LibWebView)

Tests/LibGfx/CMakeLists.txt

@@ -1,14 +1,20 @@
 set(TEST_SOURCES
-    BenchmarkJPEGLoader.cpp
     TestColor.cpp
-    TestImageDecoder.cpp
     TestImageWriter.cpp
     TestQuad.cpp
     TestRect.cpp
-    TestWOFF.cpp
-    TestWOFF2.cpp
 )
 
+# FIXME: Address runtime errors for file-based tests on Windows
+if (NOT WIN32)
+    list(APPEND TEST_SOURCES
+        BenchmarkJPEGLoader.cpp
+        TestImageDecoder.cpp
+        TestWOFF.cpp
+        TestWOFF2.cpp
+    )
+endif()
+
 foreach(source IN LISTS TEST_SOURCES)
     serenity_test("${source}" LibGfx LIBS LibGfx)
 endforeach()