Merge branch 'each-style-tweak' into 'master'

adjust clang-format options to get closer to ISC style

See merge request isc-projects/bind9!3061

(cherry picked from commit d3b49b6675)

0255a974 revise .clang-format and add a C formatting script in util
e851ed0b apply the modified style

bin/tests/optional/backtrace_test.c

@@ -19,13 +19,12 @@
 const char *expected_symbols[] = { "func3", "func2", "func1", "main" };
 
 static int
-func3()
-{
-	void *	      tracebuf[16];
-	int	      i, nframes;
-	int	      error = 0;
-	const char *  fname;
-	isc_result_t  result;
+func3() {
+	void *tracebuf[16];
+	int i, nframes;
+	int error = 0;
+	const char *fname;
+	isc_result_t result;
 	unsigned long offset;
 
 	result = isc_backtrace_gettrace(tracebuf, 16, &nframes);
@@ -72,19 +71,16 @@ func3()
 }
 
 static int
-func2()
-{
+func2() {
 	return (func3());
 }
 
 static int
-func1()
-{
+func1() {
 	return (func2());
 }
 
 int
-main()
-{
+main() {
 	return (func1());
 }