- Use /usr/bin/env to find bash, making build scripts compatiable with NixOS and other non-standard systems.

[deftdawg]

Bash is usually but not always found at /bin/bash (on NixOS it's at /run/current-system/sw/bin/bash, others systems might install in /usr/bin/bash), when bash is in the path it's a best practice to locate it using env. These changes do that.