plt-racket: a test

Closes #27318.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
remove brew info --all

Closes #27322.
pebble-sdk 2.0.1

Closes #26873.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
ghc: replace unless with if
ghc: simplify test install
ghc: move patches out of if block
ghc: remove use of std env