Add: [Win32] GDI engine for font glyph rendering as a replacement for including FreeType.

Building with FreeType is still possible and will take precedence over the GDI renderer, but
the project files don't include FreeType anymore by default. Combining GDI rendering with ICU
text layout is untested.

src/textfile_gui.cpp

@@ -196,7 +196,7 @@ void TextfileWindow::SetupScrollbars()
 
 /* virtual */ void TextfileWindow::SetFontNames(FreeTypeSettings *settings, const char *font_name)
 {
-#ifdef WITH_FREETYPE
+#if defined(WITH_FREETYPE) || defined(_WIN32)
 	strecpy(settings->mono.font, font_name, lastof(settings->mono.font));
 #endif /* WITH_FREETYPE */
 }