package/sofia-sip: don't set 'NDEBUG' explicitly

package/sofia-sip: don't set 'NDEBUG' explicitly

BR2_ENABLE_DEBUG should just steer the availability of debug symbols and
should have no negative effect on performance.

Introduction of 'assert' statements, 'debug'-type builds with additional
logging, etc. should be steered by BR2_ENABLE_RUNTIME_DEBUG instead.

The sofia-sip package was setting '--enable-ndebug' conditionally based on
BR2_ENABLE_DEBUG, and this would have to be updated to be based on
BR2_ENABLE_RUNTIME_DEBUG.

However, the sofia-sip option '--enable-ndebug' only sets the 'NDEBUG'
preprocessor macro, and the core package infrastructure already sets this
macro correctly based on BR2_ENABLE_RUNTIME_DEBUG.

This means that the explicit '--enable-ndebug' flag can be removed.

Suggested-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>