Clean minor issues with mac build

[jonmeow]

On build:

clang++: warning: argument unused during compilation: '-pie' [-Wunused-command-line-argument]

Probably need to clean up flags, but wanted to check with @chandlerc because I thought we'd tried to address this.

On run:

explorer(26799,0x118034600) malloc: nano zone abandoned due to inability to preallocate reserved vm space.

https://stackoverflow.com/questions/64126942/malloc-nano-zone-abandoned-due-to-inability-to-preallocate-reserved-vm-space

1. Undef NANO_PREALLOCATE_BAND_VM (only viable if you compile libmalloc from source)
2. Set the environment variable MallocNanoZone to 0.

I think we need option 2

╚╡which clang++
/Users/jperkins/.brew/opt/llvm/bin/clang++
╚╡clang++ --version
Homebrew clang version 14.0.6
Target: x86_64-apple-darwin21.5.0
Thread model: posix
InstalledDir: /Users/jperkins/.brew/opt/llvm/bin

[jonmeow]

Note, -pie is fastbuild+opt, nano I think may be fastbuild only (possibly because it's related to sanitizers)

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