default initialization of object of const type w/o user-provided default ctor

...same as aef1826d, actually fallout from
diverging behavior regarding DR 253 betwween GCC/libstdc++ and Clang, cf. thread
starting at <https://gcc.gnu.org/ml/libstdc++/2015-04/msg00165.html>
"std::__debug::vector default ctor must not be defaulted"

Change-Id: I9189d472b57249857d64f7d807a0e08fc1758759

sc/source/core/data/dpfilteredcache.cxx

@@ -301,7 +301,7 @@ const ::std::vector<SCROW>&  ScDPFilteredCache::getFieldEntries( sal_Int32 nColu
     if (nColumn < 0 || static_cast<size_t>(nColumn) >= maFieldEntries.size())
     {
         // index out of bound.  Hopefully this code will never be reached.
-        static const ::std::vector<SCROW> emptyEntries;
+        static const ::std::vector<SCROW> emptyEntries{};
         return emptyEntries;
     }
     return maFieldEntries[nColumn];

sd/source/ui/view/sdview.cxx

@@ -422,7 +422,7 @@ drawinglayer::primitive2d::Primitive2DSequence ViewRedirector::createRedirectedP
                                 fPosX, fPosY));
 
                             // create DXTextArray (can be empty one)
-                            const ::std::vector< double > aDXArray;
+                            const ::std::vector< double > aDXArray{};
 
                             // create locale; this may need some more information in the future
                             const ::com::sun::star::lang::Locale aLocale;