Boost also required for Gandiva

cpp/cmake_modules/ThirdpartyToolchain.cmake

@@ -609,7 +609,11 @@ set(Boost_ADDITIONAL_VERSIONS
     "1.60.0"
     "1.60")
 
-if(ARROW_BUILD_INTEGRATION OR ARROW_BUILD_TESTS OR ARROW_HDFS OR ARROW_PARQUET)
+if(ARROW_BUILD_INTEGRATION
+   OR ARROW_BUILD_TESTS
+   OR ARROW_HDFS
+   OR ARROW_GANDIVA
+   OR ARROW_PARQUET)
   set(ARROW_BOOST_REQUIRED TRUE)
 else()
   set(ARROW_BOOST_REQUIRED FALSE)