webos-image: ptmalloc3=r3

:Release Notes:
Fix licence notice in the ptmalloc3 recipe

:Detailed Notes:
ptmalloc3 contains /sysdeps/generic/malloc-machine.h licened as
LGPLv2. Since it used for build need to change LICENSE notice.

:Testing Performed:
No functional changes

:QA Notes:

:Issues Addressed:
[CMB-120] pmlogctld, popt, ptmalloc3, qtjsbackend, qtscript, Confirm the
          GPL files are not included in target image and review license
[CMB-622] CCC: ptmalloc3=LGPLv2

Change-Id: I067c553fc4d8cbc78c126401564131a9aa7ec705
Originally-reviewed-on: https://gpro.palm.com/56577
Reviewed-on: https://g2g.palm.com/6347
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>