[libc] Don't use '-nolibc' on the GPU build

[jhuber6]

Summary

We previously changed this to use nolibc to allow it to link in
compiler builtins for the CPU build. However, these options are unused
on the GPU and create a lot of noise. Furthermore, we want to use
nogpulib to prevent the linking in of the vendor libraries.

libc/cmake/modules/LLVMLibCTestRules.cmake

target_include_directories(
     PRIVATE
       ${LIBC_SOURCE_DIR}
       ${LIBC_BUILD_DIR}
       ${LIBC_BUILD_DIR}/include
   )
   target_compile_options(${fq_build_target_name}
       PRIVATE ${LIBC_HERMETIC_TEST_COMPILE_OPTIONS} ${HERMETIC_TEST_COMPILE_OPTIONS})
 
+  if(LIBC_TARGET_ARCHITECTURE_IS_GPU)
+    target_link_options(${fq_build_target_name} PRIVATE -nostdlib -static)
+  else()
     target_link_options(${fq_build_target_name} PRIVATE -nolibc -nostartfiles -nostdlib++ -static)
+  endif()
   target_link_libraries(
     ${fq_build_target_name}
     PRIVATE
       ${HERMETIC_TEST_LINK_LIBRARIES}
       libc.startup.${LIBC_TARGET_OS}.crt1
       LibcHermeticTestMain LibcHermeticTest
       # The NVIDIA 'nvlink' linker does not currently support static libraries.
       $<$<NOT:$<BOOL:${LIBC_GPU_TARGET_ARCHITECTURE_IS_NVPTX}>>:${fq_target_name}.__libc__>)