Rename util_malloc to malloc.

src/core/or/or.h

src/lib/compress/compress.c

src/lib/compress/compress_lzma.c

src/lib/container/bitarray.h

src/lib/container/bloomfilt.c

src/lib/container/buffers.c

src/lib/container/handles.h

src/lib/container/map.c

src/lib/container/smartlist.c

src/lib/crypt_ops/aes.h

src/lib/crypt_ops/crypto_digest.h

src/lib/crypt_ops/crypto_rand.c

src/lib/ctime/di_ops.c

src/lib/encoding/binascii.c

src/lib/encoding/confline.c

src/lib/encoding/cstring.c

src/lib/encoding/time_fmt.c

src/lib/evloop/compat_libevent.h

src/lib/evloop/procmon.c

src/lib/evloop/timers.c