llvm-gcc42: doesn't install llvm-gcc

[ryandesign (Ryan Carsten Schmidt)]

I cannot update pure-gen to 0.5 or later because it now requires the llvm-gcc program, but the llvm-gcc42 port does not provide a program of that name. Here is what pure-gen 0.7 says:

pure -c xxpure-gen.pure -o pure-gen
llvmc: Can't find program 'llvm-gcc'
make: *** [pure-gen] Error 1

When I ​told the author of pure that in MacPorts the program is called llvm-gcc-4.2, he said that was a bad idea. He said llvmc (part of llvm) will try to call "llvm-gcc" by that name exactly. If that's true, then llvm-gcc42 should install an executable of that name exactly.