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Include stdlib.h to fix below build warnings when MEM_LIBC_MALLOC is set:
src/core/mem.c:119:3: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration]
void* ret = mem_clib_malloc(size + MEM_LIBC_STATSHELPER_SIZE);
^
src/core/mem.c:96:25: warning: incompatible implicit declaration of built-in function 'malloc'
#define mem_clib_malloc malloc
^
src/core/mem.c:119:15: note: in expansion of macro 'mem_clib_malloc'
void* ret = mem_clib_malloc(size + MEM_LIBC_STATSHELPER_SIZE);
^
src/core/mem.c: In function 'mem_free':
src/core/mem.c:146:3: warning: implicit declaration of function 'free' [-Wimplicit-function-declaration]
mem_clib_free(rmem);
^
src/core/mem.c:93:23: warning: incompatible implicit declaration of built-in function 'free'
#define mem_clib_free free
^
src/core/mem.c:146:3: note: in expansion of macro 'mem_clib_free'
mem_clib_free(rmem);
^
Signed-off-by: Axel Lin <axel.lin@ingics.com>