Unnecessary header includes

[codebrainz]

Some of the includes from the header file could be moved to the source file since they aren't needed in the header, for example stdlib.h.

d1ff6fc#diff-25196feeaf9204f4db47ff20fc04462a3411b64db47130546f85f366fa4b769aR4

[Vsxbamboo]

md5.c : 208 char *input_buffer = malloc(1024);
Here "malloc" is used, which needs "stdlib.h".