Build with OV_VALGRIND fails

When enabling OV_VALGRIND, the OV build fails with the following error.

Compiler: gcc (Debian 8.3.0-6) 8.3.0

rte/core/ov/source/ov_vendortree.c:113:28: error: ‘ov_vendortree_getUseMalloc’ undeclared here (not in a function); did you mean ‘ov_vendortree_getRTAlloc’?
   { "use_malloc",    NULL, ov_vendortree_getUseMalloc, ov_vendortree_setUseMalloc },
                            ^~~~~~~~~~~~~~~~~~~~~~~~~~
                            ov_vendortree_getRTAlloc
rte/core/ov/source/ov_vendortree.c:113:56: error: ‘ov_vendortree_setUseMalloc’ undeclared here (not in a function); did you mean ‘ov_vendortree_getRTAlloc’?
   { "use_malloc",    NULL, ov_vendortree_getUseMalloc, ov_vendortree_setUseMalloc },
                                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~
                                                        ov_vendortree_getRTAlloc

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