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Add a `nocrypto` TUNE_FEATURE option to `feature-arm-crypto.inc` to explicitly disable ARM crypto extensions via GCC flags. This provides an opposing state to the existing `crypto` feature, enabling more explicit control over crypto-related tuning. Some vendors ship cores without crypto support, and this change allows disabling it without requiring extensive audits of dependent code paths. This approach avoids the knock-on effects caused when `nocrypto` is applied implicitly in the absence of `crypto` in TUNE_FEATURES. TUNECONFLICTS was added to prevent both features from being enabled simultaneously. When both are added, the following error is seen during build: Feature 'nocrypto' conflicts with 'crypto'. Feature 'crypto' conflicts with 'nocrypto'. (From OE-Core rev: 51e0da4db61abcc546af216609f172204ddb17ab) Signed-off-by: Jon Mason <jon.mason@arm.com> Cc: Ryan Eatmon <reatmon@ti.com> Cc: Khem Raj <raj.khem@gmail.com> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>