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vpx_mem: increase default alignment

this prevents returning an address smaller than the natural heap
alignment from vpx_malloc on e.g., x86_64

Change-Id: I283e858664a8529f28b22060c3815116a7798c0d

--- a/vpx_mem/include/vpx_mem_intrnl.h

+++ b/vpx_mem/include/vpx_mem_intrnl.h

@@ -50,12 +50,8 @@

 calls to vpx_* functions other

 than vpx_memalign*/

 # else

-#  define DEFAULT_ALIGNMENT        1

+#  define DEFAULT_ALIGNMENT        (2 * sizeof(void*))  /* NOLINT */

 # endif

-#endif

-

-#if DEFAULT_ALIGNMENT < 1

-# error "DEFAULT_ALIGNMENT must be >= 1!"

 #endif

 #if CONFIG_MEM_TRACKER