re: GCC 5.x and ia64 and MKMAINTAINERTOOLS failing

[matthew green <mrg%eterna.com.au@localhost>]

> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfne'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfcnvxf_dbl_to_quad'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfeq'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfdiv'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfsub'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfcnvff_quad_to_dbl'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfcnvxuf_dbl_to_quad'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfadd'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfcnvff_quad_to_sgl'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qflt'
> /home/scole/nbsd/src/obj/destdir.ia64/usr/lib/libgcc_s.so: undefined reference to `_U_Qfmpy'

yeah - i'm not 100% sure what the answer here is yet, but i'll get
to it soon.

for now, please switch back to GCC 4.8 for testing and please
merge your changes from PR 51261 :)  i had forgotten about this
PR when i made some of the same changes while trying to get the
build to work, sorry for stepping on some of your work.

thanks!


.mrg.