A workaround for compatibility problem, originated from r40300 changes.

Proposed in it "LD ?= gcc" assignment doesn't works both with existing
makefiles and with current version of the makefile template. User must 
define LD in it's makefile to let them work. That is bad.

This workaround uses $origin function to check for redefinition of LD
variable in user's makefile.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40739 a95241bf-73f2-0310-859d-f6bbb57e9c96

data/develop/makefile-engine

@@ -79,7 +79,9 @@ endif
 	endif
 
 #	set the linker and linker flags
-	LD			?= gcc
+ifeq ($(origin LD), default)
+	LD			:= gcc
+endif
 	LDFLAGS		+= $(DEBUG)
 
 #	SETTING: set linker flags for each binary type