Fix JNI build after removal of libcudf sub-libraries [skip ci]

[jlowe]

Fixing the Java bindings build after the removal of the libcudf sub-libraries in #7107.

[mythrocks]

I'm 👍 on this. Kicking the tyres on this now.

[mythrocks]

(Github does not allow me to add this comment because this section wasn't modified in the PR. :/)

We might need to modify the Arrow paths:

# Find static version of Arrow lib
find_library(ARROW_LIBRARY libarrow.a
  HINTS "$ENV{ARROW_ROOT}/lib"
        "$ENV{CONDA_PREFIX}/lib"
        "${CUDF_CPP_BUILD_DIR}/arrow/install/lib")

The build complains with: Arrow static libs not found. Was libcudf built with ARROW_STATIC_LIB=ON?, unless the last path is modified as follows:

find_library(ARROW_LIBRARY libarrow.a
  HINTS "$ENV{ARROW_ROOT}/lib"
        "$ENV{CONDA_PREFIX}/lib"
        "${CUDF_CPP_BUILD_DIR}/_deps/arrow-build/release")

The ARROW_INCLUDE path might need a similar change.

[jlowe]

We might need to modify the Arrow paths

Thanks @mythrocks, this accidentally worked in my env because I had some old build artifacts around that it found. I updated the hints for the Arrow paths and verified with a clean build.

[mythrocks]

LGTM!

[mythrocks]

@gpucibot merge