Commit 334dfef16055ffaf9c704b7ad25ce7540cb6ce38 changed several files into
executables. Commit f6e17887c998e7c7d460bfabb198ed5f53dd22a2 reverted the
permission of parser_test.go from 755 to 644, but missed all other
files. Later go.mod1/go.sum1 are removed. This commit fixed the
permission of remaining affected files.