This port covers an end-of-life version of GCC and is in the tree solely
to support the devel/xtensa-esp32-elf port. Since that one now is limited
to amd64 and i386, follow with our own ONLY_FOR_ARCHS setting.
This simplifies this port a fair bit and avoids building on amd/aarch64
and powerpc* platforms.
(Only the first 10 of 12 ports in this commit are shown above. )
Allow gcc compilers to be built on new arch 'powerpcspe'.
Tested for no-harm on amd64.
Submitted by: jhibbits
Approved by: portmgr (tier-2 blanket)
Differential Revision: D13126