[cmake] Fix dependencies.

* Use CMAKE_DL_LIBS instead of hard-coded `dl`.
* Use Threads::Threads instead of `pthread`.
* Drop `rt` dep.
* Find libdrm via pkgconfig (consistent to how other ROCm projects do it as documented here: https://github.com/ROCm/TheRock/blob/main/docs/development/dependencies.md#libdrm)


[ROCm/amdsmi commit: 4e6731a817]

projects/amdsmi/CMakeLists.txt

@@ -116,6 +116,12 @@ set(CPACK_PACKAGE_CONTACT "AMD-SMILib Support <amd-smi.support@amd.com>" CACHE S
 
 generic_package()
 
+## Dependencies
+find_package(Threads REQUIRED)
+pkg_check_modules(DRM REQUIRED IMPORTED_TARGET libdrm)
+pkg_check_modules(DRM_AMDGPU REQUIRED IMPORTED_TARGET libdrm_amdgpu)
+
+
 ## Compiler flags
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -fno-rtti")
 if(${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL "x86_64")

projects/amdsmi/rocm_smi/CMakeLists.txt

@@ -45,7 +45,12 @@ configure_file("src/${ROCM_SMI_TARGET}Config.in"
                "${CMAKE_CURRENT_SOURCE_DIR}/include/rocm_smi/${ROCM_SMI_TARGET}Config.h")
 
 add_library(${ROCM_SMI_TARGET} ${CMN_SRC_LIST} ${CMN_INC_LIST})
-target_link_libraries(${ROCM_SMI_TARGET} PRIVATE pthread rt dl)
+target_link_libraries(${ROCM_SMI_TARGET} PRIVATE 
+    PkgConfig::DRM
+    PkgConfig::DRM_AMDGPU
+    Threads::Threads
+    ${CMAKE_DL_LIBS}
+)
 target_include_directories(${ROCM_SMI_TARGET} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
                                                       ${PROJECT_SOURCE_DIR}/common/shared_mutex)
 

projects/amdsmi/src/CMakeLists.txt

@@ -78,7 +78,12 @@ set(${AMD_SMI}_VERSION_BUILD "0")
 message("SOVERSION: ${SO_VERSION_STRING}")
 
 add_library(${AMD_SMI} ${SRC_LIST} ${INC_LIST})
-target_link_libraries(${AMD_SMI} pthread rt dl ${DRM_LIBRARIES} ${AMDGPU_DRM_LIBRARIES})
+target_link_libraries(${AMD_SMI} PRIVATE
+    PkgConfig::DRM
+    PkgConfig::DRM_AMDGPU
+    Threads::Threads
+    ${CMAKE_DL_LIBS}
+)
 target_include_directories(${AMD_SMI} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR} ${PROJECT_SOURCE_DIR}/rocm_smi/include
                                               ${PROJECT_SOURCE_DIR}/common/shared_mutex ${ACA_INC_DIR})