Windows build fixes (working around std::u32string bugs).

src/Plugins/MagnumFontConverter/MagnumFontConverter.cpp

@@ -43,7 +43,12 @@ auto MagnumFontConverter::doFeatures() const -> Features {
     return Feature::ExportFont|Feature::ConvertData|Feature::MultiFile;
 }
 
-std::vector<std::pair<std::string, Containers::Array<unsigned char>>> MagnumFontConverter::doExportFontToData(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::u32string& characters) const {
+#ifndef _WIN32
+std::vector<std::pair<std::string, Containers::Array<unsigned char>>> MagnumFontConverter::doExportFontToData(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::u32string& characters) const
+#else
+std::vector<std::pair<std::string, Containers::Array<unsigned char>>> MagnumFontConverter::doExportFontToData(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::vector<char32_t>& characters) const
+#endif
+{
     Utility::Configuration configuration;
 
     configuration.setValue("version", 1);

src/Plugins/MagnumFontConverter/MagnumFontConverter.h

@@ -48,7 +48,11 @@ class MagnumFontConverter: public Text::AbstractFontConverter {
 
     private:
         Features doFeatures() const override;
+        #ifndef _WIN32
         std::vector<std::pair<std::string, Containers::Array<unsigned char>>> doExportFontToData(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::u32string& characters) const override;
+        #else
+        std::vector<std::pair<std::string, Containers::Array<unsigned char>>> doExportFontToData(AbstractFont& font, GlyphCache& cache, const std::string& filename, const std::vector<char32_t>& characters) const override;
+        #endif
 };
 
 }}