* stage0/x86.M1 (jmp____*%ebx): New macro.
(mov____0x8(%ebp),%ebp): New macro.
(mov____0x8(%ebp),%esp): New macro.
* include/setjmp.h (jmp_buf): Redefine as struct.
* lib/libc-mes+tcc.c (longjmp, setjmp): Implement.
* scaffold/tests/80-setjmp.c: Test it.
* make.scm ("80-setjmp"): Build it.
* .gitignore: Ignore *.tcc-guile.
