cmake/FindGSS: drop CMake <3.16 compatibility logic

Redundant since bumping minimum to 3.18.

Follow-up to 89043ba90689418a115e967633e261139b48ce23 #20407
Follow-up to 1f112242323848d0ebfc88ae97b139d18e7987f6 #18950

Closes #22072

diff --git a/CMake/FindGSS.cmake b/CMake/FindGSS.cmake
index e94067a844275f4eff6ae53a30f64605ba0c37c1..6f352b2e4f670aecb1e0146f76149ff2728d8997 100644 (file)
--- a/CMake/FindGSS.cmake
+++ b/CMake/FindGSS.cmake
@@ -192,12 +192,10 @@ if(NOT _gss_FOUND)  # Not found by pkg-config. Let us take more traditional appr
     message(FATAL_ERROR "GNU or MIT GSS is required")
   endif()
 else()
-  # _gss_MODULE_NAME set since CMake 3.16.
-  # _pkg_check_modules_pkg_name is undocumented and used as a fallback for CMake <3.16 versions.
-  if(_gss_MODULE_NAME STREQUAL _gnu_modname OR _pkg_check_modules_pkg_name STREQUAL _gnu_modname)
+  if(_gss_MODULE_NAME STREQUAL _gnu_modname)
     set(_gss_flavor "GNU")
     set(_gss_pc_requires ${_gnu_modname})
-  elseif(_gss_MODULE_NAME STREQUAL _mit_modname OR _pkg_check_modules_pkg_name STREQUAL _mit_modname)
+  elseif(_gss_MODULE_NAME STREQUAL _mit_modname)
     set(_gss_flavor "MIT")
     set(_gss_pc_requires ${_mit_modname})
   else()