[irods/irods#8332] Migrate to system-provided fmt

Author: SwooshyCueb

CMakeLists.txt

@@ -48,8 +48,7 @@ endif()
 
 find_package(OpenSSL REQUIRED COMPONENTS Crypto SSL)
 find_package(nlohmann_json "3.6.1" REQUIRED)
-find_package(fmt "8.1.1"
-  HINTS "${IRODS_EXTERNALS_FULLPATH_FMT}")
+find_package(fmt "8.1.1")
 find_package(Python 3 REQUIRED COMPONENTS Development)
 
 set(