Enable lightweight assertions in OS X packages

Author: shahmishal

Diff for: utils/build-presets.ini

@@ -550,7 +550,6 @@ swiftpm
 # Build with debug info, this allows us to symbolicate crashes from
 # production builds.
 release-debuginfo
-no-assertions
 
 dash-dash
 
@@ -605,6 +604,7 @@ installable-package=%(installable_package)s
 mixin-preset=
     mixin_osx_package_base
     mixin_osx_package_test
+    mixin_lightweight_assertions
 
 dash-dash