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/fontdetection.cpp

@@ -9,7 +9,7 @@
 
 /** @file fontdetection.cpp Detection of the right font. */
 
-#ifdef WITH_FREETYPE
+#if defined(WITH_FREETYPE) || defined(_WIN32)
 
 #include "stdafx.h"
 #include "debug.h"
@@ -17,7 +17,9 @@
 #include "string_func.h"
 #include "strings_func.h"
 
+#ifdef WITH_FREETYPE
 extern FT_Library _library;
+#endif /* WITH_FREETYPE */
 
 /**
  * Get the font loaded into a Freetype face by using a font-name.
@@ -37,6 +39,7 @@ extern FT_Library _library;
 
 #include "safeguards.h"
 
+#ifdef WITH_FREETYPE
 /**
  * Get the short DOS 8.3 format for paths.
  * FreeType doesn't support Unicode filenames and Windows' fopen (as used
@@ -241,6 +244,7 @@ err2:
 err1:
 	return ret_font_name == nullptr ? WIDE_TO_MB((const TCHAR*)logfont->elfFullName) : ret_font_name;
 }
+#endif /* WITH_FREETYPE */
 
 class FontList {
 protected:
@@ -317,6 +321,7 @@ static int CALLBACK EnumFontCallback(const ENUMLOGFONTEX *logfont, const NEWTEXT
 	char font_name[MAX_PATH];
 	convert_from_fs((const TCHAR *)logfont->elfFullName, font_name, lengthof(font_name));
 
+#ifdef WITH_FREETYPE
 	/* Add english name after font name */
 	const char *english_name = GetEnglishFontName(logfont);
 	strecpy(font_name + strlen(font_name) + 1, english_name, lastof(font_name));
@@ -337,6 +342,9 @@ static int CALLBACK EnumFontCallback(const ENUMLOGFONTEX *logfont, const NEWTEXT
 	}
 
 	if (!found) return 1;
+#else
+	const char *english_name = font_name;
+#endif /* WITH_FREETYPE */
 
 	info->callback->SetFontNames(info->settings, font_name);
 	if (info->callback->FindMissingGlyphs(nullptr)) return 1;