Improve portability of generate-runtimes.sh

[damaki]

No description provided.

[mstahl-iis]

This fixes the options problem, but I still get:

# ./generate-runtimes.sh --target rp2040
Generating runtimes
install runtime sources for rp2040
runtimes successfully installed in /Users/stahlml/Repos/ADA/community-bb-runtimes/install
Patching runtime light-rp2040
./generate-runtimes.sh: line 77: --runtime-dir=install/${profile}-${target,,}: bad substitution

The bash in MacOS is 5.3.9(1)-release (aarch64-apple-darwin25.1.0). It seems that lowercase substitution is not available.

[damaki]

Thanks for trying that out! It turns out lowercase substitution is no longer necessary, so I've removed that. Hopefully it should work now for you.

[mstahl-iis]

Works for me.

[damaki]

Thanks for confirming!