Remove malloc.h from unix systems, where it appears it does not appear to be needed.
Remove malloc.h from unix systems, where it appears it does not appear to be needed.

git-svn-id: 04e88ac4940b0408b73cd6f458a224a262abaaff@329 ec705bc8-faf6-4f9b-9aff-b4916e9bedc3

jbuchbinder/rawspeed,jbuchbinder/rawspeed