Standardize CI scripts to print both raw and GitHub actions messages when run under GitHub actions

Apparently the location information is no longer visible in build logs

Pointed out in https://github.com/DFHack/dfhack/pull/1704#issuecomment-726991055

travis/lint.py

@@ -128,21 +128,17 @@ def main():
                         lines[i] = line.decode('utf-8')
                     except UnicodeDecodeError:
                         msg_params = (rel_path, i + 1, 'Invalid UTF-8 (other errors will be ignored)')
+                        error('%s:%i: %s' % msg_params)
                         if is_github_actions:
-                            error()
                             print('::error file=%s,line=%i::%s' % msg_params)
-                        else:
-                            error('%s:%i: %s' % msg_params)
                         lines[i] = ''
             for linter in linters:
                 try:
                     linter.check(lines)
                 except LinterError as e:
+                    error('%s: %s' % (rel_path, e))
                     if is_github_actions:
-                        error()
                         print(e.github_actions_workflow_command(rel_path))
-                    else:
-                        error('%s: %s' % (rel_path, e))
                     if fix:
                         linter.fix(lines)
                         contents = '\n'.join(lines)

travis/script-syntax.py

@@ -11,6 +11,7 @@ def print_stderr(stderr, args):
         return
 
     for line in stderr.split('\n'):
+        print(line)
         parts = list(map(str.strip, line.split(':')))
         # e.g. luac prints "luac:" in front of messages, so find the first part
         # containing the actual filename
@@ -18,7 +19,6 @@ def print_stderr(stderr, args):
             if parts[i].endswith('.' + args.ext) and parts[i + 1].isdigit():
                 print('::error file=%s,line=%s::%s' % (parts[i], parts[i + 1], ':'.join(parts[i + 2:])))
                 break
-        print(line)
 
 
 def main(args):