Set HAIKU_TARGET_IS_EXECUTABLE in KernelLd as well

The kernel also needs to be stripped for m68k.

Propagate it to the revisioned binary as well.

build/jam/FileRules

@@ -341,6 +341,9 @@ rule CopySetHaikuRevision target : source
 
 	PropagateContainerUpdateTargetFlags $(target) : $(source) ;
 
+	HAIKU_TARGET_IS_EXECUTABLE on $(target) = [ on $(source)
+		return $(HAIKU_TARGET_IS_EXECUTABLE) ] ;
+
 	local revisionFile = [ DetermineHaikuRevision ] ;
 
 	Depends $(target)

build/jam/KernelRules

@@ -53,6 +53,8 @@ rule KernelLd
 	}
 	LINKLIBS on $(1) =  $(libs) $(TARGET_KERNEL_LIBGCC) ;
 
+	HAIKU_TARGET_IS_EXECUTABLE on $(1) = 1 ;
+
 	# TODO: Do we really want to invoke SetupKernel here? The objects should
 	# have been compiled with KernelObjects anyway, so we're doing that twice.
 	SetupKernel $(2) ;