build: allow building with clang+lto

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/2053

meson.build

@@ -173,11 +173,18 @@ endif
 
 enable_lto = get_option('b_lto')
 if enable_lto
-  # meson already adds '-flto'
+  if  cc.get_id() == 'clang'
+    clang_version = cc.version()
+    if clang_version <= '18.0.0'
+      error('Clang version should be greater then 18.0.0 got : ' + clang_version)
+    endif
+  else
+    # Meson already adds '-flto'
     lto_flag = '-flto-partition=none'
     assert(cc.has_argument(lto_flag), '-flto-partition=none not supported. Disable link-time optimization with -Db_lto=false.')
     common_flags += lto_flag
     common_ldflags += lto_flag
+  endif
 endif
 
 common_flags += cc.get_supported_arguments([