checkpatch: extend checks to TCL, Makefile.am and configure.ac files

The script, originally written for Linux code, skips several tests
on files whose name's extension is not in Perl list
'(h|c|s|S|sh|dtsi|dts)$'.
This causes such tests to not be executed on OpenOCD TCL files and
on Makefile.am and configure.ac.

Modify the script to include the OpenOCD files in the list.

Change-Id: I17c96bf32ee40d9390e60996e176e4e927c00197
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/8408
Reviewed-by: Marek Kraus <gamelaster@outlook.com>
Tested-by: jenkins

tools/scripts/checkpatch.pl

@@ -3769,7 +3769,11 @@ sub process {
 		}
 
 # check we are in a valid source file if not then ignore this hunk
+		if (!$OpenOCD) {
 		next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/);
+		} else { # !$OpenOCD
+		next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts|tcl|cfg|ac|am)$/);
+		} # !$OpenOCD
 
 # check for using SPDX-License-Identifier on the wrong line number
 		if ($realline != $checklicenseline &&