New Issue: 'make clobber' fails with CHPL_RE2=re2

20503, "mppf", "'make clobber' fails with CHPL_RE2=re2", "2022-08-24T20:19:39Z"

Steps to Reproduce

git clone https://github.com/chapel-lang/chapel chapel.git
cd chapel.git
export CHPL_RE2=re2
make clobber

output has

...
cd runtime && make clobber
src/qio/Makefile.include:20: src/qio/regex/re2/Makefile.include: No such file or directory
make[2]: *** No rule to make target 'src/qio/regex/re2/Makefile.include'.  Stop.
make[1]: *** [Makefile:49: clobber.helpme] Error 2
make: *** [Makefile:188: clobber] Error 2