Adding support for Odin language server (ols). (#4679)

ale_linters/odin/ols.vim

@@ -0,0 +1,19 @@
+" Author: Benjamin Block <https://github.com/benjamindblock>
+" Description: A language server for Odin.
+
+function! ale_linters#odin#ols#GetProjectRoot(buffer) abort
+    return fnamemodify('', ':h')
+endfunction
+
+call ale#Set('odin_ols_executable', 'ols')
+call ale#Set('odin_ols_config', {})
+
+call ale#linter#Define('odin', {
+\   'name': 'ols',
+\   'lsp': 'stdio',
+\   'language': 'odin',
+\   'lsp_config': {b -> ale#Var(b, 'odin_ols_config')},
+\   'executable': {b -> ale#Var(b, 'odin_ols_executable')},
+\   'command': '%e',
+\   'project_root': function('ale_linters#odin#ols#GetProjectRoot'),
+\})