HPCC-10649 Update help text to cover new options

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>

ecl/eclcc/eclcc.cpp

@@ -2010,7 +2010,9 @@ const char * const helpText[] = {
     "    -help, --help Display this message",
     "    -help -v      Display verbose help message",
     "!   -internal     Run internal tests",
-    "!   -legacy       Use legacy import semantics (deprecated)",
+    "!   -legacy       Use legacy import and when semantics (deprecated)",
+    "!   -legacyimport Use legacy import semantics (deprecated)",
+    "!   -legacywhen   Use legacy when/side-effects semantics (deprecated)",
     "    --logfile <file> Write log to specified file",
     "!   --logdetail=n Set the level of detail in the log file",
     "!   --nologfile   Do not write any logfile",