vim-patch:9.1.2060: filetype: Rasi include files are not recognized

Problem:  filetype: Rasi include files are not recognized
Solution: Detect *.rasinc as rasi filetype (Hoang Nguyen)

Reference:
- https://github.com/davatorium/rofi/blob/next/doc/rofi-theme.5.markdown#file-extension

closes: vim/vim#19103

https://github.com/vim/vim/commit/b084b8f1db40cba2971db3bdb4528770556e7ddc

Co-authored-by: Hoang Nguyen <folliekazetani@protonmail.com>

runtime/lua/vim/filetype.lua

@@ -1061,6 +1061,7 @@ local extension = {
   MODX = 'rapid',
   MODx = 'rapid',
   rasi = 'rasi',
+  rasinc = 'rasi',
   rbs = 'rbs',
   rego = 'rego',
   rem = 'remind',

test/old/testdir/test_filetype.vim

@@ -671,7 +671,7 @@ func s:GetFilenameChecks() abort
     \ 'raku': ['file.pm6', 'file.p6', 'file.t6', 'file.pod6', 'file.raku', 'file.rakumod', 'file.rakudoc', 'file.rakutest'],
     \ 'raml': ['file.raml'],
     \ 'rapid': ['file.sysx', 'file.Sysx', 'file.SysX', 'file.SYSx', 'file.SYSX', 'file.modx', 'file.Modx', 'file.ModX', 'file.MODx', 'file.MODX'],
-    \ 'rasi': ['file.rasi'],
+    \ 'rasi': ['file.rasi', 'file.rasinc'],
     \ 'ratpoison': ['.ratpoisonrc', 'ratpoisonrc'],
     \ 'rbs': ['file.rbs'],
     \ 'rc': ['file.rc', 'file.rch'],