[Bug target/85669] fail on s-case-cfn-macros: build/gencfn-macros: DEF_INTERNAL_FLT/INT_FN (%smth%) has no associated built-in functions

[dougmencken at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85669

--- Comment #23 from Douglas Mencken <dougmencken at gmail dot com> ---
Created attachment 44901
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44901&action=edit
fix_gcc8_build.patch

Reversion of r251713, updated for patching sources of 8.2 release