Fix DRTVWR-559 std::array usage in llrender and llprimitive after merge

indra/llprimitive/llgltfmaterial.h

@@ -34,6 +34,7 @@
 #include "lluuid.h"
 #include "hbxxh.h"
 
+#include <array>
 #include <string>
 #include <map>
 

indra/llrender/llrender.h

@@ -44,6 +44,8 @@
 #include "llmatrix4a.h"
 #include "glh/glh_linear.h"
 
+#include <array>
+
 class LLVertexBuffer;
 class LLCubeMap;
 class LLImageGL;