Fix issue with clang-format's config arg

clang-format has a very special syntax for passing a config file as an arg.
You must use --style=:myconfig.file.

To make this work with megalinter I updated the clang descriptor files
to correctly list the config file arg as "--style=:" and modified
the Linter.py file to not add a space to any config file args ending
in ":" as clang-format cannot have a space for its cli syntax here.

megalinter/Linter.py

@@ -1225,7 +1225,9 @@ def build_lint_command(self, file=None) -> list:
                 self.final_config_file = self.final_config_file.replace(
                     self.workspace, DEFAULT_DOCKER_WORKSPACE_DIR
                 )
-            if self.cli_config_arg_name.endswith("="):
+            if self.cli_config_arg_name.endswith(
+                "="
+            ) or self.cli_config_arg_name.endswith(":"):
                 cmd += [self.cli_config_arg_name + self.final_config_file]
             elif self.cli_config_arg_name != "":
                 cmd += [self.cli_config_arg_name, self.final_config_file]

megalinter/descriptors/c.megalinter-descriptor.yml

@@ -39,7 +39,7 @@ linters:
       - "--Werror"
       - "--dry-run"
     config_file_name: .clang-format
-    cli_config_arg_name: "--style"
+    cli_config_arg_name: "--style=file:"
     cli_lint_errors_count: regex_count
     cli_lint_errors_regex: "code should be clang-formatted"
     examples:

megalinter/descriptors/cpp.megalinter-descriptor.yml

@@ -49,7 +49,7 @@ linters:
       - "--Werror"
       - "--dry-run"
     config_file_name: .clang-format
-    cli_config_arg_name: "--style"
+    cli_config_arg_name: "--style=file:"
     cli_lint_errors_count: regex_count
     cli_lint_errors_regex: "code should be clang-formatted"
     examples: