Fix #2421 - Use compile_commands.json in build dirs to find roots

test/command_callback/test_c_cquery_command_callbacks.vader

@@ -7,9 +7,9 @@ After:
 Execute(The project root should be detected correctly using compile_commands.json file):
   AssertLSPProject ''
 
-  call ale#test#SetFilename('cquery_paths/with_compile_commands_json/dummy.c')
+  call ale#test#SetFilename('cquery_paths/dummy.c')
 
-  AssertLSPProject ale#path#Simplify(g:dir . '/cquery_paths/with_compile_commands_json')
+  AssertLSPProject ale#path#Simplify(g:dir . '/cquery_paths')
 
 Execute(The project root should be detected correctly using .cquery file):
   AssertLSPProject ''

test/command_callback/test_c_import_paths.vader

@@ -2,6 +2,7 @@ Before:
   " Make sure the c.vim file is loaded first.
   call ale#c#FindProjectRoot(bufnr(''))
 
+  Save g:ale_c_parse_compile_commands
   Save g:ale_c_parse_makefile
   Save g:__ale_c_project_filenames
 
@@ -14,6 +15,7 @@ Before:
   \ 'v:val isnot# ''.git/HEAD'''
   \)
 
+  let g:ale_c_parse_compile_commands = 0
   let g:ale_c_parse_makefile = 0
 
 After:

test/command_callback/test_cpp_cquery_command_callbacks.vader

@@ -10,9 +10,9 @@ After:
 Execute(The project root should be detected correctly using compile_commands.json file):
   AssertLSPProject ''
 
-  call ale#test#SetFilename('cquery_paths/with_compile_commands_json/dummy.cpp')
+  call ale#test#SetFilename('cquery_paths/dummy.cpp')
 
-  AssertLSPProject ale#path#Simplify(g:dir . '/cquery_paths/with_compile_commands_json')
+  AssertLSPProject ale#path#Simplify(g:dir . '/cquery_paths')
 
 Execute(The project root should be detected correctly using .cquery file):
   AssertLSPProject ''