Remove unnecessary flag from build.sh (#16879)

This CMake option was removed by #15483.

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - James Lamb (https://github.com/jameslamb)

URL: #16879

build.sh

@@ -239,11 +239,6 @@ if hasArg --pydevelop; then
     PYTHON_ARGS_FOR_INSTALL="${PYTHON_ARGS_FOR_INSTALL} -e"
 fi
 
-# Append `-DFIND_CUDF_CPP=ON` to EXTRA_CMAKE_ARGS unless a user specified the option.
-if [[ "${EXTRA_CMAKE_ARGS}" != *"DFIND_CUDF_CPP"* ]]; then
-    EXTRA_CMAKE_ARGS="${EXTRA_CMAKE_ARGS} -DFIND_CUDF_CPP=ON"
-fi
-
 if hasArg --disable_large_strings; then
     BUILD_DISABLE_LARGE_STRINGS="ON"
 fi