patch 8.2.4514: Vim9: some flow commands can be shortened

Problem:    Vim9: some flow commands can be shortened.
Solution:   Also require using the full name for ":return", ":enddef",
            ":continue", ":export" and ":import".
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 40e5075..cf4bfdc 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -408,7 +408,7 @@
 	EX_BANG|EX_TRLBAR|EX_WORD1|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),
 EXCMD(CMD_continue,	"continue",	ex_continue,
-	EX_TRLBAR|EX_SBOXOK|EX_CMDWIN|EX_LOCK_OK,
+	EX_TRLBAR|EX_SBOXOK|EX_CMDWIN|EX_LOCK_OK|EX_WHOLE,
 	ADDR_NONE),
 EXCMD(CMD_confirm,	"confirm",	ex_wrongmodifier,
 	EX_NEEDARG|EX_EXTRA|EX_NOTRLCOM|EX_CMDWIN|EX_LOCK_OK,
@@ -567,7 +567,7 @@
 	EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_NONE),
 EXCMD(CMD_enddef,	"enddef",	ex_endfunction,
-	EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
+	EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK|EX_WHOLE,
 	ADDR_NONE),
 EXCMD(CMD_endenum,	"endenum",	ex_ni,
 	EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
@@ -603,7 +603,7 @@
 	EX_RANGE|EX_WHOLEFOLD|EX_BANG|EX_FILE1|EX_ARGOPT|EX_DFLALL|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_LINES),
 EXCMD(CMD_export,	"export",	ex_export,
-	EX_EXTRA|EX_NOTRLCOM|EX_EXPR_ARG|EX_CMDWIN|EX_LOCK_OK,
+	EX_EXTRA|EX_NOTRLCOM|EX_EXPR_ARG|EX_CMDWIN|EX_LOCK_OK|EX_WHOLE,
 	ADDR_NONE),
 EXCMD(CMD_exusage,	"exusage",	ex_exusage,
 	EX_TRLBAR,
@@ -732,7 +732,7 @@
 	EX_RANGE|EX_ZEROR|EX_EXTRA|EX_TRLBAR|EX_NOTRLCOM|EX_CTRLV|EX_CMDWIN|EX_LOCK_OK,
 	ADDR_OTHER),
 EXCMD(CMD_import,	"import",	ex_import,
-	EX_EXTRA|EX_NOTRLCOM|EX_CMDWIN|EX_LOCK_OK,
+	EX_EXTRA|EX_NOTRLCOM|EX_CMDWIN|EX_LOCK_OK|EX_WHOLE,
 	ADDR_NONE),
 EXCMD(CMD_inoremap,	"inoremap",	ex_map,
 	EX_EXTRA|EX_TRLBAR|EX_NOTRLCOM|EX_CTRLV|EX_CMDWIN|EX_LOCK_OK,
@@ -1281,7 +1281,7 @@
 	EX_TRLBAR|EX_RANGE|EX_WHOLEFOLD|EX_DFLALL|EX_BANG|EX_WORD1|EX_CMDWIN|EX_LOCK_OK|EX_MODIFY,
 	ADDR_LINES),
 EXCMD(CMD_return,	"return",	ex_return,
-	EX_EXTRA|EX_NOTRLCOM|EX_SBOXOK|EX_CMDWIN|EX_LOCK_OK,
+	EX_EXTRA|EX_NOTRLCOM|EX_SBOXOK|EX_CMDWIN|EX_LOCK_OK|EX_WHOLE,
 	ADDR_NONE),
 EXCMD(CMD_rewind,	"rewind",	ex_rewind,
 	EX_EXTRA|EX_BANG|EX_CMDARG|EX_ARGOPT|EX_TRLBAR,