patch 8.2.0149: maintaining a Vim9 branch separately is more work

Problem:    Maintaining a Vim9 branch separately is more work.
Solution:   Merge the Vim9 script changes.
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 53e49d5..10b9ed7 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -442,6 +442,9 @@
 EXCMD(CMD_debuggreedy,	"debuggreedy",	ex_debuggreedy,
 	EX_RANGE|EX_ZEROR|EX_TRLBAR|EX_CMDWIN,
 	ADDR_OTHER),
+EXCMD(CMD_def,		"def",		ex_function,
+	EX_EXTRA|EX_BANG|EX_SBOXOK|EX_CMDWIN,
+	ADDR_NONE),
 EXCMD(CMD_delcommand,	"delcommand",	ex_delcommand,
 	EX_NEEDARG|EX_WORD1|EX_TRLBAR|EX_CMDWIN,
 	ADDR_NONE),
@@ -475,6 +478,9 @@
 EXCMD(CMD_digraphs,	"digraphs",	ex_digraphs,
 	EX_BANG|EX_EXTRA|EX_TRLBAR|EX_CMDWIN,
 	ADDR_NONE),
+EXCMD(CMD_disassemble,	"disassemble",	ex_disassemble,
+	EX_EXTRA|EX_TRLBAR|EX_CMDWIN,
+	ADDR_NONE),
 EXCMD(CMD_djump,	"djump",	ex_findpat,
 	EX_BANG|EX_RANGE|EX_DFLALL|EX_WHOLEFOLD|EX_EXTRA,
 	ADDR_LINES),
@@ -529,6 +535,9 @@
 EXCMD(CMD_endif,	"endif",	ex_endif,
 	EX_TRLBAR|EX_SBOXOK|EX_CMDWIN,
 	ADDR_NONE),
+EXCMD(CMD_enddef,	"enddef",	ex_endfunction,
+	EX_TRLBAR|EX_CMDWIN,
+	ADDR_NONE),
 EXCMD(CMD_endfunction,	"endfunction",	ex_endfunction,
 	EX_TRLBAR|EX_CMDWIN,
 	ADDR_NONE),
@@ -556,6 +565,9 @@
 EXCMD(CMD_exit,		"exit",		ex_exit,
 	EX_RANGE|EX_WHOLEFOLD|EX_BANG|EX_FILE1|EX_ARGOPT|EX_DFLALL|EX_TRLBAR|EX_CMDWIN,
 	ADDR_LINES),
+EXCMD(CMD_export,	"export",	ex_export,
+	EX_EXTRA|EX_NOTRLCOM,
+	ADDR_NONE),
 EXCMD(CMD_exusage,	"exusage",	ex_exusage,
 	EX_TRLBAR,
 	ADDR_NONE),
@@ -679,6 +691,9 @@
 EXCMD(CMD_imenu,	"imenu",	ex_menu,
 	EX_RANGE|EX_ZEROR|EX_EXTRA|EX_TRLBAR|EX_NOTRLCOM|EX_CTRLV|EX_CMDWIN,
 	ADDR_OTHER),
+EXCMD(CMD_import,	"import",	ex_import,
+	EX_EXTRA|EX_NOTRLCOM,
+	ADDR_NONE),
 EXCMD(CMD_inoremap,	"inoremap",	ex_map,
 	EX_EXTRA|EX_TRLBAR|EX_NOTRLCOM|EX_CTRLV|EX_CMDWIN,
 	ADDR_NONE),
@@ -1648,6 +1663,9 @@
 EXCMD(CMD_vimgrepadd,	"vimgrepadd",	ex_vimgrep,
 	EX_RANGE|EX_BANG|EX_NEEDARG|EX_EXTRA|EX_NOTRLCOM|EX_TRLBAR|EX_XFILE,
 	ADDR_OTHER),
+EXCMD(CMD_vim9script,	"vim9script",	ex_vim9script,
+	0,
+	ADDR_NONE),
 EXCMD(CMD_viusage,	"viusage",	ex_viusage,
 	EX_TRLBAR,
 	ADDR_NONE),