Remove profiles from non root packages

[mkroening]

Fixes:

warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
package:   rftrace/examples/hermitrust/Cargo.toml
workspace: rftrace/Cargo.toml

[tlambertz]

The profiles are there intentionally (even if not well documented currently), so that if you copy the example outside of the workspace it still works in debug mode.

default:
	# we need to override the opt level for the dev profile, since we are in a workspace with other settings!
	# not needed if this folder stands on its own, since the profiles in the cargo.toml take effect
	# BUT: we build in release anyway so trace is smaller.
CARGO_PROFILE_DEV_OPT_LEVEL=1 cargo build ....

[mkroening]

All right. 👍

[mkroening]

Reopening, since this is not required on Hermit since November 2021: hermit-os/hermit-rs@f055471

[mkroening]

Rebased on latest master.