Fix typo

Author: auxten

contrib/arrow-cmake/CMakeLists.txt

@@ -424,7 +424,7 @@ set(ARROW_SRCS
 
 if (OS_LINUX)
     SET(ARROW_SRCS "${LIBRARY_DIR}/memory_pool_jemalloc.cc" ${ARROW_SRCS})
-elseif()
+endif()
 
 add_definitions(-DARROW_WITH_LZ4)
 SET(ARROW_SRCS "${LIBRARY_DIR}/util/compression_lz4.cc" ${ARROW_SRCS})