Exclude files generated by generate-wait_event_types.pl from pgindent

The format of these files becomes arguably worse after being indented,
and, as they are generated, there is no point in applying an indentation
anyway.

Author: Bharath Rupireddy
Discussion: https://postgr.es/m/CALj2ACW2JUocmieuR3n9AXL4iSsHcL1LmNkiukuFRUvKNMoiKg@mail.gmail.com

src/tools/pgindent/exclude_file_patterns

@@ -12,6 +12,12 @@ src/include/jit/llvmjit\.h$
 src/backend/nodes/\w+\.funcs\.c$
 src/backend/nodes/\w+\.switch\.c$
 #
+# These are generated by generate-wait_event_types.pl, whose format
+# looks worse with pgindent.
+src/backend/utils/activity/pgstat_wait_event\.c$
+src/backend/utils/activity/wait_event_funcs_data\.c$
+src/backend/utils/activity/wait_event_types\.h$
+#
 # This confuses pgindent, and it's a derived file anyway.
 src/backend/utils/fmgrtab\.c$
 #