Ignore expansion-to-defined warning from dlmalloc include

system/core/libpixelflinger/codeflinger/../../../../external/dlmalloc/malloc.c:588:22: note: expanded from macro 'USE_LOCKS'
#define USE_LOCKS  ((defined(USE_SPIN_LOCKS) && USE_SPIN_LOCKS != 0) || \
                     ^
system/core/libpixelflinger/codeflinger/../../../../external/dlmalloc/malloc.c:2742:5: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
system/core/libpixelflinger/codeflinger/../../../../external/dlmalloc/malloc.c:589:22: note: expanded from macro 'USE_LOCKS'
                    (defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0))

Test: m checkbuild
Bug: 29823425
Change-Id: I3acbcb9c9cab3713041fc130358f7ecdec70a589