calcGlueState(): move State enum to file-global anonymous namespace

so that it can be used in templates in strict C++98.
C++11 allows local types (i.e. without linkage) to be used in templates.

sc/source/ui/unoobj/chart2uno.cxx

@@ -599,6 +599,8 @@ void Chart2Positioner::glueState()
     calcGlueState(nC, nR);
 }
 
+enum State { Hole = 0, Occupied = 1, Free = 2, Glue = 3 };
+
 void Chart2Positioner::calcGlueState(SCCOL nColSize, SCROW nRowSize)
 {
     // TODO: This code can use some space optimization.  Using an array to
@@ -607,8 +609,6 @@ void Chart2Positioner::calcGlueState(SCCOL nColSize, SCROW nRowSize)
 
     sal_uInt32 nCR = static_cast<sal_uInt32>(nColSize*nRowSize);
 
-    enum State { Hole = 0, Occupied = 1, Free = 2, Glue = 3 };
-
     vector<State> aCellStates(nCR, Hole);
 
     // Mark all referenced cells "occupied".