[Bug target/68605] Add -mno-crt0 to disable automatic crt0 injection

[rearnsha at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68605

--- Comment #5 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
If you look at the examples I cite you'll find they rarely, if ever, change
because of changes to GCC.  This interface has been stable for year.