PDFBOX-5905: add DejaVu Sans font as fallback for Zapf Dingbats, as suggested by Robert Amidon

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1922574 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdmodel/font/FontMapperImpl.java

@@ -99,7 +99,7 @@ final class FontMapperImpl implements FontMapper
                         "NimbusRomNo9L-MediItal")));
         addSubstitutes("Symbol", new ArrayList<>(Arrays.asList("Symbol", "SymbolMT", "StandardSymL")));
         addSubstitutes("ZapfDingbats", new ArrayList<>(Arrays.asList("ZapfDingbatsITCbyBT-Regular", 
-                        "ZapfDingbatsITC", "Dingbats", "MS-Gothic")));
+                        "ZapfDingbatsITC", "Dingbats", "MS-Gothic", "DejaVuSans")));
 
         // Acrobat also uses alternative names for Standard 14 fonts, which we map to those above
         // these include names such as "Arial" and "TimesNewRoman"