patch 9.1.0249: filetype: rock_manifest and config.ld files are not recognized

Problem:  filetype: rock_manifest and config.ld files are not recognized
Solution: Detect 'rock_manifest' and 'config.ld' as lua
          (Wu, Zhenyu)

closes: #14370

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/filetype.vim

@@ -1269,7 +1269,10 @@ au BufNewFile,BufRead .luaurc		setf jsonc
 au BufNewFile,BufRead .luacheckrc		setf lua
 
 " Luarocks
-au BufNewFile,BufRead *.rockspec		setf lua
+au BufNewFile,BufRead *.rockspec,rock_manifest	setf lua
+
+" Luadoc, Ldoc
+au BufNewFile,BufRead config.ld			setf lua
 
 " Linden Scripting Language (Second Life)
 au BufNewFile,BufRead *.lsl			call dist#ft#FTlsl()

src/testdir/test_filetype.vim

@@ -396,7 +396,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     lpc: ['file.lpc', 'file.ulpc'],
     lsl: ['file.lsl'],
     lss: ['file.lss'],
-    lua: ['file.lua', 'file.tlu', 'file.rockspec', 'file.nse', '.luacheckrc', '.busted'],
+    lua: ['file.lua', 'file.tlu', 'file.rockspec', 'file.nse', '.luacheckrc', '.busted', 'rock_manifest', 'config.ld'],
     luau: ['file.luau'],
     lynx: ['lynx.cfg'],
     lyrics: ['file.lrc'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    249,
 /**/
     248,
 /**/