cmake: Update --help output to discourage use of --find-package mode
Fixes: #21056
diff --git a/Source/cmakemain.cxx b/Source/cmakemain.cxx
index 7c66c5c..4600fc5 100644
--- a/Source/cmakemain.cxx
+++ b/Source/cmakemain.cxx
@@ -71,7 +71,7 @@
{ "--open <dir>", "Open generated project in the associated application." },
{ "-N", "View mode only." },
{ "-P <file>", "Process script mode." },
- { "--find-package", "Run in pkg-config like mode." },
+ { "--find-package", "Legacy pkg-config like mode. Do not use." },
{ "--graphviz=[file]",
"Generate graphviz of dependencies, see "
"CMakeGraphVizOptions.cmake for more." },