[offload] Move FrontendOffloading dep to PluginCommon

As requested in
#118173 (comment).

Author: mgorny

offload/plugins-nextgen/amdgpu/CMakeLists.txt

@@ -8,12 +8,6 @@ target_sources(omptarget.rtl.amdgpu PRIVATE src/rtl.cpp)
 target_include_directories(omptarget.rtl.amdgpu PRIVATE
                            ${CMAKE_CURRENT_SOURCE_DIR}/utils)
 
-set(USE_SHARED)
-if (LLVM_LINK_LLVM_DYLIB)
-  set(USE_SHARED USE_SHARED)
-endif()
-llvm_config(omptarget.rtl.amdgpu ${USE_SHARED} FrontendOffloading)
-
 if(hsa-runtime64_FOUND AND NOT "amdgpu" IN_LIST LIBOMPTARGET_DLOPEN_PLUGINS)
   message(STATUS "Building AMDGPU plugin linked against libhsa")
   target_link_libraries(omptarget.rtl.amdgpu PRIVATE hsa-runtime64::hsa-runtime64)

offload/plugins-nextgen/common/CMakeLists.txt

@@ -50,7 +50,7 @@ set(USE_SHARED)
 if (LLVM_LINK_LLVM_DYLIB)
   set(USE_SHARED USE_SHARED)
 endif()
-llvm_config(PluginCommon ${USE_SHARED} ProfileData)
+llvm_config(PluginCommon ${USE_SHARED} FrontendOffloading ProfileData)
 
 target_include_directories(PluginCommon PUBLIC
   ${CMAKE_CURRENT_SOURCE_DIR}/include