Fixed build error on aarch64. Enumerator value '-1' is outside the range of

underlying type 'char'.
(grafted from 1b4a6dbdc42664a5763d278ed4a2f4eba5dd749f)

--HG--
branch : develop

src/libs/vpatterndb/vpiece.h

@@ -50,7 +50,7 @@ class VPointF;
 QT_WARNING_PUSH
 QT_WARNING_DISABLE_GCC("-Weffc++")
 
-enum class PassmarkStatus: char
+enum class PassmarkStatus: qint8
 {
     Error = 0,
     Common = 1,