FontConfig character/lang match requires weak family.

src/ports/SkFontMgr_fontconfig.cpp

Index: src/ports/SkFontMgr_fontconfig.cpp
diff --git a/src/ports/SkFontMgr_fontconfig.cpp b/src/ports/SkFontMgr_fontconfig.cpp
index 485e0fc6cc235846f581786f4c8d00c49c192ce3..58597d93952bcc07a630c1c9a8a85f1445df13bc 100644
--- a/src/ports/SkFontMgr_fontconfig.cpp
+++ b/src/ports/SkFontMgr_fontconfig.cpp
@@ -771,7 +771,10 @@ protected:
         FCLocker lock;
 
         SkAutoFcPattern pattern;
-        FcPatternAddString(pattern, FC_FAMILY, (FcChar8*)familyName);
+        FcValue familyNameValue;
+        familyNameValue.type = FcTypeString;
+        familyNameValue.u.s = reinterpret_cast<const FcChar8*>(familyName);
+        FcPatternAddWeak(pattern, FC_FAMILY, familyNameValue, FcFalse);
         fcpattern_from_skfontstyle(style, pattern);
 
         SkAutoFcCharSet charSet;