Find the system copy of spdlog which then tells us how to link
against both it & libfmt correctly, rather than accidentally
picking up system spdlog headers and nothing else (defines, needed
libraries, etc) when (for some reason?) FetchContent fails and we don't
realise it.

TODO: Figure out why FetchContent(?) failing doesn't kill the build
TODO: Add a proper option for this to use the system copy/not

Bug: https://bugs.gentoo.org/930157
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -57,9 +57,6 @@ elseif(Git_FOUND)
 	endif()
 endif()
 
-include(FetchContent)
-set(SPDLOG_ROOT "${FETCHCONTENT_BASE_DIR}/spdlog-src")
-
 # Update other relevant variables to include the patch
 set(PROJECT_VERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}")
 set(CMAKE_PROJECT_VERSION_PATCH "${PROJECT_VERSION_PATCH}")
@@ -166,7 +163,6 @@ endif()
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/source/wrapper/include)
-include_directories(${SPDLOG_ROOT}/include)
 
 include_directories("${CMAKE_CURRENT_SOURCE_DIR}")
 
diff --git a/source/utils/CMakeLists.txt b/source/utils/CMakeLists.txt
index cb6cfb1..4e486d8 100644
--- a/source/utils/CMakeLists.txt
+++ b/source/utils/CMakeLists.txt
@@ -1,23 +1,11 @@
 # Copyright (C) 2024 Intel Corporation
 # SPDX-License-Identifier: MIT
 
-include(FetchContent)
-set(SPDLOG_REPO https://github.com/gabime/spdlog)
-set(SPDLOG_TAG v1.13.0)
-FetchContent_Declare(
-    spdlog
-    GIT_REPOSITORY ${SPDLOG_REPO}
-    GIT_TAG ${SPDLOG_TAG}
-)
-FetchContent_makeAvailable(spdlog)
+find_package(spdlog)
 
 add_library(utils
-  STATIC
   "logging.h"
   "logging.cpp"
 )
 
-target_include_directories(utils
-  PUBLIC
-  ${FETCHCONTENT_BASE_DIR}/spdlog-src/include
-)
+target_link_libraries(utils spdlog::spdlog)