fish: tiger_g4e bottle secretly depends on gcc formula being installed and linked

Steps to replicate:

Be using a G4e machine.
Be running Tiger.
brew install --bottle fish
brew unlink gcc
fish

Expected result

Welcome to fish, the friendly interactive shell

Actual result

dyld: Symbol not found: __ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEED1Ev
  Referenced from: /usr/local/bin/fish
  Expected in: /usr/lib/libstdc++.6.dylib

fish: 'fish' terminated by signal SIGTRAP (Trace or breakpoint trap)

Notes

I haven't tried building fish from source with gcc unlinked.
I don't know what library exactly dyld is missing, but I imagine it might be /usr/local/lib/gcc/7/libstdc++.6.dylib.

Output of `brew --config`

``` HOMEBREW_VERSION: 0.9.5 ORIGIN: https://github.com/mistydemeo/tigerbrew.git HEAD: 1508070c8a2d42bf915e8597efd7b46ecb72fa6e Last commit: 8 weeks ago HOMEBREW_PREFIX: /usr/local HOMEBREW_REPOSITORY: /usr/local HOMEBREW_CELLAR: /usr/local/Cellar HOMEBREW_BOTTLE_DOMAIN: https://ia904500.us.archive.org/24/items/tigerbrew CPU: single-core 32-bit g4e OS X: 10.4.11-Power Macintosh Curl: /usr/local/Library/Homebrew/vendor/portable-curl/current/bin/curl Xcode: 2.5 CLT: N/A GCC-4.0: build 5370 GCC-4.2: build 5553 Clang: N/A X11: 1.1.3 => /usr/X11R6 System Ruby: 2.3.3-222 => /usr/local/Library/Homebrew/vendor/portable-ruby/2.3.3/bin/ruby Perl: /usr/local/opt/perl/bin/perl => /usr/local/Cellar/perl/5.40.0/bin/perl Python: /usr/bin/python => /System/Library/Frameworks/Python.framework/Versions/2.3/bin/python Ruby: /usr/bin/ruby => /Users/sam Java: N/A ```

Output of `brew doctor`

``` Warning: You have unlinked kegs in your Cellar Leaving kegs unlinked can lead to build-trouble and cause brews that depend on those kegs to fail to run properly once built. Run `brew link` on these: ghc70 ```

mistydemeo / tigerbrew