BISON_TARGET always generates dependency in Ninja for output file
I have several simple BISON_TARGET rules (some contain DEFINES_FILE, some not, but none using VERBOSE or REPORT_FILE). With 3.6.2 they worked fine, but with 3.7.0 the bison rule is always executed. Using "ninja -d explain" I can see it's because the output file doesn't exist. If I add VERBOSE to the rules, things work as before (except that I get the output files, too).