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`brew install x86_64-elf-binutils` fails, because latest gcc version is
8 and `/usr/local/opt/gcc@7/` directory does not exist.
By designating gcc version at dependens_on argument, brew install
`gcc@7` if it does not exist.

Use '/usr/local/opt/gcc@7' instead of '/usr/local/opt/gcc'

See merge request !4

Homebrew uess gcc-8 for gcc and no longer gcc-7. To continue
to use gcc-7 in homebrew, we will need to install gcc@7. gcc@7
will then be linked to '/usr/local/opt/gcc@7'.

Update deprecated Formula to Formulary.

Updated dependencies to use gcc7

Updated dependices to use gcc7 as using thats the latest version from homebrew, using gcc6 would cause build errors as that this branch fixed

Fix GCC configuration error.

Apparently GCC builds require explicit locations for these libraries.

Please merge to newer version