maintenance of gcc cross ports

[James Shuriff]

The powerpc64-gcc port and all the ports that use it as a master (aarch64-gcc, aarch64-none-elf-gcc, amd64-gcc, arm-none-eabi-gcc, i386-gcc, mips-gcc, mips64-gcc, and sparc64-gcc) are very old and use buggy makefiles. I would like to take over maintenance of these ports. Powerpc64-gcc uses an old version of gcc and the makefile is buggy. Certain variables use bad regular expressions thus don't do what they're supposed to do. I've fixed up the makefiles and made new plists with a newer version of gcc.

- James Shuriff

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