patch-CMakeLists.txt

--- CMakeLists.txt.orig	2021-04-21 16:14:36 UTC
+++ CMakeLists.txt
@@ -98,7 +98,7 @@ set(ARROW_BINARY_DIR ${PROJECT_BINARY_DIR})
 
 include(CMakePackageConfigHelpers)
 include(CMakeParseArguments)
-include(ExternalProject)
+#include(ExternalProject) # bundling isn't allowed
 include(FindPackageHandleStandardArgs)
 
 include(GNUInstallDirs)
@@ -910,10 +910,10 @@ if(ARROW_BUILD_EXAMPLES)
   add_subdirectory(examples/arrow)
 endif()
 
-install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/../LICENSE.txt
-              ${CMAKE_CURRENT_SOURCE_DIR}/../NOTICE.txt
-              ${CMAKE_CURRENT_SOURCE_DIR}/README.md
-        DESTINATION "${ARROW_DOC_DIR}")
+#install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/../LICENSE.txt
+#              ${CMAKE_CURRENT_SOURCE_DIR}/../NOTICE.txt
+#              ${CMAKE_CURRENT_SOURCE_DIR}/README.md
+#        DESTINATION "${ARROW_DOC_DIR}")
 
 #
 # Validate and print out Arrow configuration options