[Bug analyzer/93388] ensure -fanalyzer works with our C code

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93388

--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Looks like "make BOOT_CFLAGS='-fanalyzer' bootstrap" could also be used, but
it's nice to have a way to do this via configure flags.