powerpc build failures with gcc master

[Joel Sherrill]

Hi

The GCC master no longer supports the -mno-spe flag.  This results
in configure time failures that GCC does not work:

configure:3499: powerpc-rtems5-gcc -mcpu=8540 -meabi -msdata=sysv
-fno-common -msoft-float -mno-spe -Og -g -ffunction-sections
-fdata-sections   conftest.c  >&5
powerpc-rtems5-gcc: error: unrecognized command line option '-mno-spe'; did
you mean '-fno-see'?

This impacts the t32mppc and all mpc55xx variants.

Looks like deleting the option is the correct solution. Any other thoughts
on how to correct this?

--joel
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