Fixes hard-coded path to cache
Skips profile munging w/o UPDATE_PROFILE env var
Adds patch_go step before compile_go runs

Older versions of Go don't compile properly under Arch with recent GCC.
Add ability to patch the source before it's compiled.
Adds patch for Go r60.3
Adds patch for Go 1.0.3
Fixes quoting so completion works in zsh