crt: msvcr80.def.in: Fix some some I386 symbol names which miss @SIZE suffix

I386 symbols __CxxLongjmpUnwind, _adj_fdiv_m*, _adj_fdivr_m* and
_seh_longjmp_unwind use stdcall convention, so add @SIZE suffix
for them into I386 version of def file for msvcr80.dll.

(_adj_fdiv* actually aren't stdcall but a custom calling convention;
these will be fixed further in a later upcoming commit.)

Fix symbol names in lib32/msvcr80.def.in file.

Signed-off-by: Martin Storsjö <martin@martin.st>