Fix specifying GPU architecture in JNI build (#7612)

After #7593 the variables for controlling the CUDA build for either all architectures or detected architectures changed to be based on the project name which broke the JNI build.  This updates the JNI CMakeList accordingly to fix the JNI build.

Authors:
  - Jason Lowe (@jlowe)

Approvers:
  - Rong Ou (@rongou)
  - Gera Shegalov (@gerashegalov)
  - Thomas Graves (@tgravescs)

URL: #7612

java/src/main/native/CMakeLists.txt

@@ -17,10 +17,7 @@ cmake_minimum_required(VERSION 3.18 FATAL_ERROR)
 
 # Use GPU_ARCHS if it is defined
 if(DEFINED GPU_ARCHS)
-  unset(CMAKE_CUDA_ARCHITECTURES CACHE)
-  if(NOT "${GPU_ARCHS}" STREQUAL "ALL")
-    set(CMAKE_CUDA_ARCHITECTURES "${GPU_ARCHS}")
-  endif()
+  set(CMAKE_CUDA_ARCHITECTURES "${GPU_ARCHS}")
 endif()
 
 # If `CMAKE_CUDA_ARCHITECTURES` is not defined, build for all supported architectures. If
@@ -29,11 +26,10 @@ endif()
 
 # This needs to be run before enabling the CUDA language due to the default initialization behavior
 # of `CMAKE_CUDA_ARCHITECTURES`, https://gitlab.kitware.com/cmake/cmake/-/issues/21302
-if(NOT DEFINED CMAKE_CUDA_ARCHITECTURES)
-  set(CUDF_BUILD_FOR_ALL_ARCHS TRUE)
+if(NOT DEFINED CMAKE_CUDA_ARCHITECTURES OR CMAKE_CUDA_ARCHITECTURES STREQUAL "ALL")
+  set(CUDF_JNI_BUILD_FOR_ALL_ARCHS TRUE)
 elseif(CMAKE_CUDA_ARCHITECTURES STREQUAL "")
-  unset(CMAKE_CUDA_ARCHITECTURES CACHE)
-  set(CUDF_BUILD_FOR_DETECTED_ARCHS TRUE)
+  set(CUDF_JNI_BUILD_FOR_DETECTED_ARCHS TRUE)
 endif()
 
 project(CUDF_JNI VERSION 0.19 LANGUAGES C CXX)