Use 'LIBS+= ...' instead of 'LIBS= ...' in the generated makefile so that the user can override libraries at build time.  This is makes it easier to cross-compile crunch builds.
Use 'LIBS+= ...' instead of 'LIBS= ...' in the generated makefile
so that the user can override libraries at build time.  This is
makes it easier to cross-compile crunch builds.

Suggested by:	luigi
MFC after:	3 days

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