pull in latest osmcode/libosmium changes

third_party/libosmium/cmake/FindOsmium.cmake

@@ -226,7 +226,6 @@ if(Osmium_USE_SPARSEHASH)
     if(SPARSEHASH_INCLUDE_DIR)
         # Find size of sparsetable::size_type. This does not work on older
         # CMake versions because they can do this check only in C, not in C++.
-        # Until we find a better way, we'll live with that.
         include(CheckTypeSize)
         set(CMAKE_REQUIRED_INCLUDES ${SPARSEHASH_INCLUDE_DIR})
         set(CMAKE_EXTRA_INCLUDE_FILES "google/sparsetable")
@@ -234,14 +233,19 @@ if(Osmium_USE_SPARSEHASH)
         set(CMAKE_EXTRA_INCLUDE_FILES)
         set(CMAKE_REQUIRED_INCLUDES)
 
+        # Falling back to checking size_t if google::sparsetable<int>::size_type
+        # could not be checked.
+        if(SPARSETABLE_SIZE_TYPE STREQUAL "")
+            check_type_size("void*" VOID_PTR_SIZE)
+            set(SPARSETABLE_SIZE_TYPE ${VOID_PTR_SIZE})
+        endif()
+
         # Sparsetable::size_type must be at least 8 bytes (64bit), otherwise
         # OSM object IDs will not fit.
         if(SPARSETABLE_SIZE_TYPE GREATER 7)
             set(SPARSEHASH_FOUND 1)
             add_definitions(-DOSMIUM_WITH_SPARSEHASH=${SPARSEHASH_FOUND})
             list(APPEND OSMIUM_INCLUDE_DIRS ${SPARSEHASH_INCLUDE_DIR})
-        elseif(SPARSETABLE_SIZE_TYPE STREQUAL "")
-            message(WARNING "Osmium: Disabled Google SparseHash library because we can't detect whether we are on a 64bit system.")
         else()
             message(WARNING "Osmium: Disabled Google SparseHash library on 32bit system (size_type=${SPARSETABLE_SIZE_TYPE}).")
         endif()