Without the change build fails on upstream gcc-10 as:
ld: utils.o:include/email.h:81: multiple definition of `Mopts'; email.o:include/email.h:81: first defined here
ld: utils.o:include/email.h:64: multiple definition of `table'; email.o:include/email.h:64: first defined here
ld: utils.o:include/email.h:65: multiple definition of `conf_file'; email.o:include/email.h:65: first defined here