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vpx_mem: allow VPX_MAX_ALLOCABLE_MEMORY to be overridden

this allows the define to be set by the build environment

Change-Id: Ib40111c5d9bae417b031b8b40a7bc135c6734044

--- a/vpx_mem/vpx_mem.c

+++ b/vpx_mem/vpx_mem.c

@@ -16,11 +16,13 @@

 #include "include/vpx_mem_intrnl.h"

 #include "vpx/vpx_integer.h"

+#if !defined(VPX_MAX_ALLOCABLE_MEMORY)

 #if SIZE_MAX > (1ULL << 40)

 #define VPX_MAX_ALLOCABLE_MEMORY (1ULL << 40)

 #else

 // For 32-bit targets keep this below INT_MAX to avoid valgrind warnings.

 #define VPX_MAX_ALLOCABLE_MEMORY ((1ULL << 31) - (1 << 16))

+#endif

 #endif

 // Returns 0 in case of overflow of nmemb * size.